libs/zlib: bump to latest stable release 1.2.12 (CVE-2018-25032)

List of changes since previous release from 2018 is quite long:

 * Fix crc32.c to compile local functions only if used.
 * Check for cc masquerading as gcc or clang in configure.
 * Remove destructive aspects of make distclean.
 * Separate out address sanitizing from warnings in configure.
 * Eliminate use of ULL constants.
 * Add fallthrough comments for gcc.
 * Clean up minizip to reduce warnings for testing.
 * Fix unztell64() in minizip to work past 4GB. (Daniël Hörchner)
 * minizip warning fix if MAXU32 already defined. (gvollant)
 * Replace black/white with allow/block. (theresa-m)
 * Fix indentation in minizip's zip.c.
 * Improve portability of contrib/minizip.
 * Correct typo in blast.c.
 * Change macro name in inflate.c to avoid collision in VxWorks.
 * Clarify gz* function interfaces, referring to parameter names.
 * Fix error in comment on the polynomial representation of a byte.
 * Fix memory leak on error in gzlog.c.
 * Avoid adding empty gzip member after gzflush with Z_FINISH.
 * Explicitly note that the 32-bit check values are 32 bits.
 * Use ARM crc32 instructions if the ARM architecture has them.
 * Add use of the ARMv8 crc32 instructions when requested.
 * Correct comment in crc32.c.
 * Don't bother computing check value after successful inflateSync().
 * Use atomic test and set, if available, for dynamic CRC tables.
 * Speed up software CRC-32 computation by a factor of 1.5 to 3.
 * Add crc32_combine_gen() and crc32_combine_op() for fast combines.
 * Add tables for crc32_combine(), to speed it up by a factor of 200.
 * Fix the zran.c example to work on a multiple-member gzip file.
 * Add gznorm.c example, which normalizes gzip files.
 * Show all the codes for the maximum tables size in enough.c.
 * Clarify that prefix codes are counted in enough.c.
 * Use inline function instead of macro for index in enough.c.
 * Clean up code style in enough.c, update version.
 * Use a macro for the printf format of big_t in enough.c.
 * Use a structure to make globals in enough.c evident.
 * Assure that the number of bits for deflatePrime() is valid.
 * Fix a bug that can crash deflate on some input when using Z_FIXED.
 * Correct the initialization requirements for deflateInit2().
 * Emphasize the need to continue decompressing gzip members.
 * Add legal disclaimer to README.
 * Fix deflateEnd() to not report an error at start of raw deflate.
 * Remove old assembler code in which bugs have manifested.
 * Make the names in functions declarations identical to definitions.
 * Avoid an undefined behavior of memcpy() in _tr_stored_block().
 * Avoid undefined behaviors of memcpy() in gz*printf().
 * Avoid an undefined behavior of memcpy() in gzappend().
 * Avoid the use of ptrdiff_t.
 * Handle case where inflateSync used when header never processed.
 * Don't compute check value for raw inflate if asked to validate.
 * Add address checking in clang to -w option of configure.
 * Return an error if the gzputs string length can't fit in an int.
 * Small speedup to inflate [psumbera].
 * Update use of errno for newer Windows CE versions.
 * Avoid some conversion warnings in gzread.c and gzwrite.c.
 * Have Makefile return non-zero error code on test failure.
 * Avoid a conversion error in gzseek when off_t type too small.
 * Fix CLEAR_HASH macro to be usable as a single statement.
 * Fix bug when window full in deflate_stored().
 * Limit hash table inserts after switch from stored deflate.
 * Permit a deflateParams() parameter change as soon as possible.
 * Cygwin does not have _wopen(), so do not create gzopen_w() there.

Removed 006-fix-compressor-crash-on-certain-inputs.patch which was
hotfix for CVE-2018-25032 and is now included in this release.

This release is not available on @SF (yet?) so the sources are now
pulled from GitHub.

Fixes: CVE-2018-25032
Signed-off-by: Petr Štetiar <ynezz@true.cz>

3 files changed, 13 insertions, 362 deletions

diff --git a/package/libs/zlib/Makefile b/package/libs/zlib/Makefile
index 7321ec51c5..8512394ff4 100644
--- a/package/libs/zlib/Makefile
+++ b/package/libs/zlib/Makefile
@@ -8,12 +8,13 @@
 include $(TOPDIR)/rules.mk
 
 PKG_NAME:=zlib
-PKG_VERSION:=1.2.11
-PKG_RELEASE:=4
+PKG_VERSION:=1.2.12
+PKG_RELEASE:=$(AUTORELEASE)
 
-PKG_SOURCE:=$(PKG_NAME)-$(PKG_VERSION).tar.xz
-PKG_SOURCE_URL:=@SF/libpng http://www.zlib.net
-PKG_HASH:=4ff941449631ace0d4d203e3483be9dbc9da454084111f97ea0a2114e19bf066
+PKG_SOURCE_PROTO:=git
+PKG_SOURCE_URL:=https://github.com/madler/zlib
+PKG_MIRROR_HASH:=a162fc219763635f0c1591ec515d4b08684e4b0bfb4b1c8e65e4eab18d597c27
+PKG_SOURCE_VERSION:=21767c654d31d2dccdde4330529775c6c5fd5389
 
 PKG_LICENSE:=Zlib
 PKG_LICENSE_FILES:=README
diff --git a/package/libs/zlib/patches/001-neon-implementation-of-adler32.patch b/package/libs/zlib/patches/001-neon-implementation-of-adler32.patch
index 843ef45c7d..9ed784e3d3 100644
--- a/package/libs/zlib/patches/001-neon-implementation-of-adler32.patch
+++ b/package/libs/zlib/patches/001-neon-implementation-of-adler32.patch
@@ -21,11 +21,9 @@ https://bugs.chromium.org/p/chromium/issues/detail?id=688601
  4 files changed, 166 insertions(+), 8 deletions(-)
  create mode 100644 contrib/arm/neon_adler32.c
 
-diff --git a/CMakeLists.txt b/CMakeLists.txt
-index 0fe939df..8e75f664 100644
 --- a/CMakeLists.txt
 +++ b/CMakeLists.txt
-@@ -7,6 +7,7 @@ set(VERSION "1.2.11")
+@@ -7,6 +7,7 @@ set(VERSION "1.2.12")
  
  option(ASM686 "Enable building i686 assembly implementation")
  option(AMD64 "Enable building amd64 assembly implementation")
@@ -94,23 +92,18 @@ index d0be4380..45ebaa4b 100644
  }
  
  /* ========================================================================= */
-diff --git a/contrib/README.contrib b/contrib/README.contrib
-index a411d5c3..3fd1d202 100644
 --- a/contrib/README.contrib
 +++ b/contrib/README.contrib
-@@ -12,6 +12,9 @@ amd64/      by Mikhail Teterin <mi@ALDAN.algebra.com>
-         asm code for AMD64
-         See patch at http://www.freebsd.org/cgi/query-pr.cgi?pr=bin/96393
+@@ -8,6 +8,9 @@ ada/        by Dmitriy Anisimkov <anisim
+         Support for Ada
+         See http://zlib-ada.sourceforge.net/
  
 +arm/        by Adenilson Cavalcanti <cavalcantii@chromium.org>
 +        ARM optimizations (NEON and ARMv8 code).
 +
- asm686/     by Brian Raiter <breadbox@muppetlabs.com>
-         asm code for Pentium and PPro/PII, using the AT&T (GNU as) syntax
-         See http://www.muppetlabs.com/~breadbox/software/assembly.html
-diff --git a/contrib/arm/neon_adler32.c b/contrib/arm/neon_adler32.c
-new file mode 100644
-index 00000000..f173a74f
+ blast/      by Mark Adler <madler@alumni.caltech.edu>
+         Decompressor for output of PKWare Data Compression Library (DCL)
+ 
 --- /dev/null
 +++ b/contrib/arm/neon_adler32.c
 @@ -0,0 +1,137 @@
diff --git a/package/libs/zlib/patches/006-fix-compressor-crash-on-certain-inputs.patch b/package/libs/zlib/patches/006-fix-compressor-crash-on-certain-inputs.patch
deleted file mode 100644
index 9f37ba5c58..0000000000
--- a/package/libs/zlib/patches/006-fix-compressor-crash-on-certain-inputs.patch
+++ /dev/null
@@ -1,343 +0,0 @@
-From 5c44459c3b28a9bd3283aaceab7c615f8020c531 Mon Sep 17 00:00:00 2001
-From: Mark Adler <madler@alumni.caltech.edu>
-Date: Tue, 17 Apr 2018 22:09:22 -0700
-Subject: [PATCH] Fix a bug that can crash deflate on some input when using
- Z_FIXED.
-
-This bug was reported by Danilo Ramos of Eideticom, Inc. It has
-lain in wait 13 years before being found! The bug was introduced
-in zlib 1.2.2.2, with the addition of the Z_FIXED option. That
-option forces the use of fixed Huffman codes. For rare inputs with
-a large number of distant matches, the pending buffer into which
-the compressed data is written can overwrite the distance symbol
-table which it overlays. That results in corrupted output due to
-invalid distances, and can result in out-of-bound accesses,
-crashing the application.
-
-The fix here combines the distance buffer and literal/length
-buffers into a single symbol buffer. Now three bytes of pending
-buffer space are opened up for each literal or length/distance
-pair consumed, instead of the previous two bytes. This assures
-that the pending buffer cannot overwrite the symbol table, since
-the maximum fixed code compressed length/distance is 31 bits, and
-since there are four bytes of pending space for every three bytes
-of symbol space.
----
- deflate.c | 74 ++++++++++++++++++++++++++++++++++++++++---------------
- deflate.h | 25 +++++++++----------
- trees.c   | 50 +++++++++++--------------------------
- 3 files changed, 79 insertions(+), 70 deletions(-)
-
-diff --git a/deflate.c b/deflate.c
-index 425babc00..19cba873a 100644
---- a/deflate.c
-+++ b/deflate.c
-@@ -255,11 +255,6 @@ int ZEXPORT deflateInit2_(strm, level, method, windowBits, memLevel, strategy,
-     int wrap = 1;
-     static const char my_version[] = ZLIB_VERSION;
- 
--    ushf *overlay;
--    /* We overlay pending_buf and d_buf+l_buf. This works since the average
--     * output size for (length,distance) codes is <= 24 bits.
--     */
--
-     if (version == Z_NULL || version[0] != my_version[0] ||
-         stream_size != sizeof(z_stream)) {
-         return Z_VERSION_ERROR;
-@@ -329,9 +324,47 @@ int ZEXPORT deflateInit2_(strm, level, method, windowBits, memLevel, strategy,
- 
-     s->lit_bufsize = 1 << (memLevel + 6); /* 16K elements by default */
- 
--    overlay = (ushf *) ZALLOC(strm, s->lit_bufsize, sizeof(ush)+2);
--    s->pending_buf = (uchf *) overlay;
--    s->pending_buf_size = (ulg)s->lit_bufsize * (sizeof(ush)+2L);
-+    /* We overlay pending_buf and sym_buf. This works since the average size
-+     * for length/distance pairs over any compressed block is assured to be 31
-+     * bits or less.
-+     *
-+     * Analysis: The longest fixed codes are a length code of 8 bits plus 5
-+     * extra bits, for lengths 131 to 257. The longest fixed distance codes are
-+     * 5 bits plus 13 extra bits, for distances 16385 to 32768. The longest
-+     * possible fixed-codes length/distance pair is then 31 bits total.
-+     *
-+     * sym_buf starts one-fourth of the way into pending_buf. So there are
-+     * three bytes in sym_buf for every four bytes in pending_buf. Each symbol
-+     * in sym_buf is three bytes -- two for the distance and one for the
-+     * literal/length. As each symbol is consumed, the pointer to the next
-+     * sym_buf value to read moves forward three bytes. From that symbol, up to
-+     * 31 bits are written to pending_buf. The closest the written pending_buf
-+     * bits gets to the next sym_buf symbol to read is just before the last
-+     * code is written. At that time, 31*(n-2) bits have been written, just
-+     * after 24*(n-2) bits have been consumed from sym_buf. sym_buf starts at
-+     * 8*n bits into pending_buf. (Note that the symbol buffer fills when n-1
-+     * symbols are written.) The closest the writing gets to what is unread is
-+     * then n+14 bits. Here n is lit_bufsize, which is 16384 by default, and
-+     * can range from 128 to 32768.
-+     *
-+     * Therefore, at a minimum, there are 142 bits of space between what is
-+     * written and what is read in the overlain buffers, so the symbols cannot
-+     * be overwritten by the compressed data. That space is actually 139 bits,
-+     * due to the three-bit fixed-code block header.
-+     *
-+     * That covers the case where either Z_FIXED is specified, forcing fixed
-+     * codes, or when the use of fixed codes is chosen, because that choice
-+     * results in a smaller compressed block than dynamic codes. That latter
-+     * condition then assures that the above analysis also covers all dynamic
-+     * blocks. A dynamic-code block will only be chosen to be emitted if it has
-+     * fewer bits than a fixed-code block would for the same set of symbols.
-+     * Therefore its average symbol length is assured to be less than 31. So
-+     * the compressed data for a dynamic block also cannot overwrite the
-+     * symbols from which it is being constructed.
-+     */
-+
-+    s->pending_buf = (uchf *) ZALLOC(strm, s->lit_bufsize, 4);
-+    s->pending_buf_size = (ulg)s->lit_bufsize * 4;
- 
-     if (s->window == Z_NULL || s->prev == Z_NULL || s->head == Z_NULL ||
-         s->pending_buf == Z_NULL) {
-@@ -340,8 +373,12 @@ int ZEXPORT deflateInit2_(strm, level, method, windowBits, memLevel, strategy,
-         deflateEnd (strm);
-         return Z_MEM_ERROR;
-     }
--    s->d_buf = overlay + s->lit_bufsize/sizeof(ush);
--    s->l_buf = s->pending_buf + (1+sizeof(ush))*s->lit_bufsize;
-+    s->sym_buf = s->pending_buf + s->lit_bufsize;
-+    s->sym_end = (s->lit_bufsize - 1) * 3;
-+    /* We avoid equality with lit_bufsize*3 because of wraparound at 64K
-+     * on 16 bit machines and because stored blocks are restricted to
-+     * 64K-1 bytes.
-+     */
- 
-     s->level = level;
-     s->strategy = strategy;
-@@ -552,7 +589,7 @@ int ZEXPORT deflatePrime (strm, bits, value)
- 
-     if (deflateStateCheck(strm)) return Z_STREAM_ERROR;
-     s = strm->state;
--    if ((Bytef *)(s->d_buf) < s->pending_out + ((Buf_size + 7) >> 3))
-+    if (s->sym_buf < s->pending_out + ((Buf_size + 7) >> 3))
-         return Z_BUF_ERROR;
-     do {
-         put = Buf_size - s->bi_valid;
-@@ -1113,7 +1150,6 @@ int ZEXPORT deflateCopy (dest, source)
- #else
-     deflate_state *ds;
-     deflate_state *ss;
--    ushf *overlay;
- 
- 
-     if (deflateStateCheck(source) || dest == Z_NULL) {
-@@ -1133,8 +1169,7 @@ int ZEXPORT deflateCopy (dest, source)
-     ds->window = (Bytef *) ZALLOC(dest, ds->w_size, 2*sizeof(Byte));
-     ds->prev   = (Posf *)  ZALLOC(dest, ds->w_size, sizeof(Pos));
-     ds->head   = (Posf *)  ZALLOC(dest, ds->hash_size, sizeof(Pos));
--    overlay = (ushf *) ZALLOC(dest, ds->lit_bufsize, sizeof(ush)+2);
--    ds->pending_buf = (uchf *) overlay;
-+    ds->pending_buf = (uchf *) ZALLOC(dest, ds->lit_bufsize, 4);
- 
-     if (ds->window == Z_NULL || ds->prev == Z_NULL || ds->head == Z_NULL ||
-         ds->pending_buf == Z_NULL) {
-@@ -1148,8 +1183,7 @@ int ZEXPORT deflateCopy (dest, source)
-     zmemcpy(ds->pending_buf, ss->pending_buf, (uInt)ds->pending_buf_size);
- 
-     ds->pending_out = ds->pending_buf + (ss->pending_out - ss->pending_buf);
--    ds->d_buf = overlay + ds->lit_bufsize/sizeof(ush);
--    ds->l_buf = ds->pending_buf + (1+sizeof(ush))*ds->lit_bufsize;
-+    ds->sym_buf = ds->pending_buf + ds->lit_bufsize;
- 
-     ds->l_desc.dyn_tree = ds->dyn_ltree;
-     ds->d_desc.dyn_tree = ds->dyn_dtree;
-@@ -1925,7 +1959,7 @@ local block_state deflate_fast(s, flush)
-         FLUSH_BLOCK(s, 1);
-         return finish_done;
-     }
--    if (s->last_lit)
-+    if (s->sym_next)
-         FLUSH_BLOCK(s, 0);
-     return block_done;
- }
-@@ -2056,7 +2090,7 @@ local block_state deflate_slow(s, flush)
-         FLUSH_BLOCK(s, 1);
-         return finish_done;
-     }
--    if (s->last_lit)
-+    if (s->sym_next)
-         FLUSH_BLOCK(s, 0);
-     return block_done;
- }
-@@ -2131,7 +2165,7 @@ local block_state deflate_rle(s, flush)
-         FLUSH_BLOCK(s, 1);
-         return finish_done;
-     }
--    if (s->last_lit)
-+    if (s->sym_next)
-         FLUSH_BLOCK(s, 0);
-     return block_done;
- }
-@@ -2170,7 +2204,7 @@ local block_state deflate_huff(s, flush)
-         FLUSH_BLOCK(s, 1);
-         return finish_done;
-     }
--    if (s->last_lit)
-+    if (s->sym_next)
-         FLUSH_BLOCK(s, 0);
-     return block_done;
- }
-diff --git a/deflate.h b/deflate.h
-index 23ecdd312..d4cf1a98b 100644
---- a/deflate.h
-+++ b/deflate.h
-@@ -217,7 +217,7 @@ typedef struct internal_state {
-     /* Depth of each subtree used as tie breaker for trees of equal frequency
-      */
- 
--    uchf *l_buf;          /* buffer for literals or lengths */
-+    uchf *sym_buf;        /* buffer for distances and literals/lengths */
- 
-     uInt  lit_bufsize;
-     /* Size of match buffer for literals/lengths.  There are 4 reasons for
-@@ -239,13 +239,8 @@ typedef struct internal_state {
-      *   - I can't count above 4
-      */
- 
--    uInt last_lit;      /* running index in l_buf */
--
--    ushf *d_buf;
--    /* Buffer for distances. To simplify the code, d_buf and l_buf have
--     * the same number of elements. To use different lengths, an extra flag
--     * array would be necessary.
--     */
-+    uInt sym_next;      /* running index in sym_buf */
-+    uInt sym_end;       /* symbol table full when sym_next reaches this */
- 
-     ulg opt_len;        /* bit length of current block with optimal trees */
-     ulg static_len;     /* bit length of current block with static trees */
-@@ -325,20 +320,22 @@ void ZLIB_INTERNAL _tr_stored_block OF((deflate_state *s, charf *buf,
- 
- # define _tr_tally_lit(s, c, flush) \
-   { uch cc = (c); \
--    s->d_buf[s->last_lit] = 0; \
--    s->l_buf[s->last_lit++] = cc; \
-+    s->sym_buf[s->sym_next++] = 0; \
-+    s->sym_buf[s->sym_next++] = 0; \
-+    s->sym_buf[s->sym_next++] = cc; \
-     s->dyn_ltree[cc].Freq++; \
--    flush = (s->last_lit == s->lit_bufsize-1); \
-+    flush = (s->sym_next == s->sym_end); \
-    }
- # define _tr_tally_dist(s, distance, length, flush) \
-   { uch len = (uch)(length); \
-     ush dist = (ush)(distance); \
--    s->d_buf[s->last_lit] = dist; \
--    s->l_buf[s->last_lit++] = len; \
-+    s->sym_buf[s->sym_next++] = dist; \
-+    s->sym_buf[s->sym_next++] = dist >> 8; \
-+    s->sym_buf[s->sym_next++] = len; \
-     dist--; \
-     s->dyn_ltree[_length_code[len]+LITERALS+1].Freq++; \
-     s->dyn_dtree[d_code(dist)].Freq++; \
--    flush = (s->last_lit == s->lit_bufsize-1); \
-+    flush = (s->sym_next == s->sym_end); \
-   }
- #else
- # define _tr_tally_lit(s, c, flush) flush = _tr_tally(s, 0, c)
-diff --git a/trees.c b/trees.c
-index 4f4a65011..decaeb7c3 100644
---- a/trees.c
-+++ b/trees.c
-@@ -416,7 +416,7 @@ local void init_block(s)
- 
-     s->dyn_ltree[END_BLOCK].Freq = 1;
-     s->opt_len = s->static_len = 0L;
--    s->last_lit = s->matches = 0;
-+    s->sym_next = s->matches = 0;
- }
- 
- #define SMALLEST 1
-@@ -948,7 +948,7 @@ void ZLIB_INTERNAL _tr_flush_block(s, buf, stored_len, last)
- 
-         Tracev((stderr, "\nopt %lu(%lu) stat %lu(%lu) stored %lu lit %u ",
-                 opt_lenb, s->opt_len, static_lenb, s->static_len, stored_len,
--                s->last_lit));
-+                s->sym_next / 3));
- 
-         if (static_lenb <= opt_lenb) opt_lenb = static_lenb;
- 
-@@ -1017,8 +1017,9 @@ int ZLIB_INTERNAL _tr_tally (s, dist, lc)
-     unsigned dist;  /* distance of matched string */
-     unsigned lc;    /* match length-MIN_MATCH or unmatched char (if dist==0) */
- {
--    s->d_buf[s->last_lit] = (ush)dist;
--    s->l_buf[s->last_lit++] = (uch)lc;
-+    s->sym_buf[s->sym_next++] = dist;
-+    s->sym_buf[s->sym_next++] = dist >> 8;
-+    s->sym_buf[s->sym_next++] = lc;
-     if (dist == 0) {
-         /* lc is the unmatched char */
-         s->dyn_ltree[lc].Freq++;
-@@ -1033,30 +1034,7 @@ int ZLIB_INTERNAL _tr_tally (s, dist, lc)
-         s->dyn_ltree[_length_code[lc]+LITERALS+1].Freq++;
-         s->dyn_dtree[d_code(dist)].Freq++;
-     }
--
--#ifdef TRUNCATE_BLOCK
--    /* Try to guess if it is profitable to stop the current block here */
--    if ((s->last_lit & 0x1fff) == 0 && s->level > 2) {
--        /* Compute an upper bound for the compressed length */
--        ulg out_length = (ulg)s->last_lit*8L;
--        ulg in_length = (ulg)((long)s->strstart - s->block_start);
--        int dcode;
--        for (dcode = 0; dcode < D_CODES; dcode++) {
--            out_length += (ulg)s->dyn_dtree[dcode].Freq *
--                (5L+extra_dbits[dcode]);
--        }
--        out_length >>= 3;
--        Tracev((stderr,"\nlast_lit %u, in %ld, out ~%ld(%ld%%) ",
--               s->last_lit, in_length, out_length,
--               100L - out_length*100L/in_length));
--        if (s->matches < s->last_lit/2 && out_length < in_length/2) return 1;
--    }
--#endif
--    return (s->last_lit == s->lit_bufsize-1);
--    /* We avoid equality with lit_bufsize because of wraparound at 64K
--     * on 16 bit machines and because stored blocks are restricted to
--     * 64K-1 bytes.
--     */
-+    return (s->sym_next == s->sym_end);
- }
- 
- /* ===========================================================================
-@@ -1069,13 +1047,14 @@ local void compress_block(s, ltree, dtree)
- {
-     unsigned dist;      /* distance of matched string */
-     int lc;             /* match length or unmatched char (if dist == 0) */
--    unsigned lx = 0;    /* running index in l_buf */
-+    unsigned sx = 0;    /* running index in sym_buf */
-     unsigned code;      /* the code to send */
-     int extra;          /* number of extra bits to send */
- 
--    if (s->last_lit != 0) do {
--        dist = s->d_buf[lx];
--        lc = s->l_buf[lx++];
-+    if (s->sym_next != 0) do {
-+        dist = s->sym_buf[sx++] & 0xff;
-+        dist += (unsigned)(s->sym_buf[sx++] & 0xff) << 8;
-+        lc = s->sym_buf[sx++];
-         if (dist == 0) {
-             send_code(s, lc, ltree); /* send a literal byte */
-             Tracecv(isgraph(lc), (stderr," '%c' ", lc));
-@@ -1100,11 +1079,10 @@ local void compress_block(s, ltree, dtree)
-             }
-         } /* literal or match pair ? */
- 
--        /* Check that the overlay between pending_buf and d_buf+l_buf is ok: */
--        Assert((uInt)(s->pending) < s->lit_bufsize + 2*lx,
--               "pendingBuf overflow");
-+        /* Check that the overlay between pending_buf and sym_buf is ok: */
-+        Assert(s->pending < s->lit_bufsize + sx, "pendingBuf overflow");
- 
--    } while (lx < s->last_lit);
-+    } while (sx < s->sym_next);
- 
-     send_code(s, END_BLOCK, ltree);
- }