diff options
Diffstat (limited to 'toolchain/uClibc/patches-0.9.30.3')
| -rw-r--r-- | toolchain/uClibc/patches-0.9.30.3/902-Fix-use-after-free-bug-in-__dns_lookup.patch | 45 |
1 files changed, 45 insertions, 0 deletions
diff --git a/toolchain/uClibc/patches-0.9.30.3/902-Fix-use-after-free-bug-in-__dns_lookup.patch b/toolchain/uClibc/patches-0.9.30.3/902-Fix-use-after-free-bug-in-__dns_lookup.patch new file mode 100644 index 0000000000..3a6f43d340 --- /dev/null +++ b/toolchain/uClibc/patches-0.9.30.3/902-Fix-use-after-free-bug-in-__dns_lookup.patch @@ -0,0 +1,45 @@ +From c602079e5b7ba998d1dd6cae4a305af80e6cba52 Mon Sep 17 00:00:00 2001 +From: Gabor Juhos <juhosg@openwrt.org> +Date: Tue, 23 Mar 2010 08:35:27 +0100 +Subject: [PATCH] Fix use-after-free bug in __dns_lookup. + +If the type of the first answer does not match with the requested type, +then the dotted name will be freed. If there are no further answers in +the DNS reply, this pointer will be used later on in the same function. +Additionally it is passed to the caller, and may cause strange behaviour. + +For example, the following busybox commands are triggering a segmentation +fault with uClibc 0.9.30.x + + - nslookup ipv6.google.com + - ping ipv6.google.com + - wget http//ipv6.google.com/ + +Signed-off-by: Gabor Juhos <juhosg@openwrt.org> + +--- + +See https://dev.openwrt.org/ticket/6886 for a testcase +--- + libc/inet/resolv.c | 4 +--- + 1 files changed, 1 insertions(+), 3 deletions(-) + +diff --git a/libc/inet/resolv.c b/libc/inet/resolv.c +index 0a6fd7a..e76f0aa 100644 +--- a/libc/inet/resolv.c ++++ b/libc/inet/resolv.c +@@ -1501,10 +1501,8 @@ int attribute_hidden __dns_lookup(const char *name, + memcpy(a, &ma, sizeof(ma)); + if (a->atype != T_SIG && (NULL == a->buf || (type != T_A && type != T_AAAA))) + break; +- if (a->atype != type) { +- free(a->dotted); ++ if (a->atype != type) + continue; +- } + a->add_count = h.ancount - j - 1; + if ((a->rdlength + sizeof(struct in_addr*)) * a->add_count > a->buflen) + break; +-- +1.5.3.2 + |