From e97709c9d18903f5acd5fbe2985dd054da0432b1 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Micha=C5=82=20K=C4=99pie=C5=84?= Date: Wed, 29 Jun 2022 14:57:35 +0200 Subject: [PATCH 2/4] mtd: always initialize 'stats' in struct mtd_oob_ops MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit As the 'stats' field in struct mtd_oob_ops is used in conditional expressions, ensure it is always zero-initialized in all such structures to prevent random stack garbage from being interpreted as a pointer. Strictly speaking, this problem currently only needs to be fixed for struct mtd_oob_ops structures subsequently passed to mtd_read_oob(). However, this commit goes a step further and makes all instances of struct mtd_oob_ops in the tree zero-initialized, in hope of preventing future problems, e.g. if struct mtd_req_stats gets extended with write statistics at some point. Signed-off-by: Michał Kępień Signed-off-by: Miquel Raynal Link: https://lore.kernel.org/linux-mtd/20220629125737.14418-3-kernel@kempniu.pl --- drivers/mtd/inftlcore.c | 6 +++--- drivers/mtd/mtdswap.c | 6 +++--- drivers/mtd/nand/onenand/onenand_base.c | 4 ++-- drivers/mtd/nand/onenand/onenand_bbt.c | 2 +- drivers/mtd/nand/raw/nand_bbt.c | 8 ++++---- drivers/mtd/nand/raw/sm_common.c | 2 +- drivers/mtd/nftlcore.c | 6 +++--- drivers/mtd/sm_ftl.c | 4 ++-- drivers/mtd/ssfdc.c | 2 +- drivers/mtd/tests/nandbiterrs.c | 2 +- drivers/mtd/tests/oobtest.c | 8 ++++---- drivers/mtd/tests/readtest.c | 2 +- fs/jffs2/wbuf.c | 6 +++--- 13 files changed, 29 insertions(+), 29 deletions(-) --- a/drivers/mtd/inftlcore.c +++ b/drivers/mtd/inftlcore.c @@ -136,7 +136,7 @@ static void inftl_remove_dev(struct mtd_ int inftl_read_oob(struct mtd_info *mtd, loff_t offs, size_t len, size_t *retlen, uint8_t *buf) { - struct mtd_oob_ops ops; + struct mtd_oob_ops ops = { }; int res; ops.mode = MTD_OPS_PLACE_OOB; @@ -156,7 +156,7 @@ int inftl_read_oob(struct mtd_info *mtd, int inftl_write_oob(struct mtd_info *mtd, loff_t offs, size_t len, size_t *retlen, uint8_t *buf) { - struct mtd_oob_ops ops; + struct mtd_oob_ops ops = { }; int res; ops.mode = MTD_OPS_PLACE_OOB; @@ -176,7 +176,7 @@ int inftl_write_oob(struct mtd_info *mtd static int inftl_write(struct mtd_info *mtd, loff_t offs, size_t len, size_t *retlen, uint8_t *buf, uint8_t *oob) { - struct mtd_oob_ops ops; + struct mtd_oob_ops ops = { }; int res; ops.mode = MTD_OPS_PLACE_OOB; --- a/drivers/mtd/mtdswap.c +++ b/drivers/mtd/mtdswap.c @@ -323,7 +323,7 @@ static int mtdswap_read_markers(struct m struct mtdswap_oobdata *data, *data2; int ret; loff_t offset; - struct mtd_oob_ops ops; + struct mtd_oob_ops ops = { }; offset = mtdswap_eb_offset(d, eb); @@ -370,7 +370,7 @@ static int mtdswap_write_marker(struct m struct mtdswap_oobdata n; int ret; loff_t offset; - struct mtd_oob_ops ops; + struct mtd_oob_ops ops = { }; ops.ooboffs = 0; ops.oobbuf = (uint8_t *)&n; @@ -879,7 +879,7 @@ static unsigned int mtdswap_eblk_passes( loff_t base, pos; unsigned int *p1 = (unsigned int *)d->page_buf; unsigned char *p2 = (unsigned char *)d->oob_buf; - struct mtd_oob_ops ops; + struct mtd_oob_ops ops = { }; int ret; ops.mode = MTD_OPS_AUTO_OOB; --- a/drivers/mtd/nand/onenand/onenand_base.c +++ b/drivers/mtd/nand/onenand/onenand_base.c @@ -2935,7 +2935,7 @@ static int do_otp_write(struct mtd_info struct onenand_chip *this = mtd->priv; unsigned char *pbuf = buf; int ret; - struct mtd_oob_ops ops; + struct mtd_oob_ops ops = { }; /* Force buffer page aligned */ if (len < mtd->writesize) { @@ -2977,7 +2977,7 @@ static int do_otp_lock(struct mtd_info * size_t *retlen, u_char *buf) { struct onenand_chip *this = mtd->priv; - struct mtd_oob_ops ops; + struct mtd_oob_ops ops = { }; int ret; if (FLEXONENAND(this)) { --- a/drivers/mtd/nand/onenand/onenand_bbt.c +++ b/drivers/mtd/nand/onenand/onenand_bbt.c @@ -61,7 +61,7 @@ static int create_bbt(struct mtd_info *m int startblock; loff_t from; size_t readlen, ooblen; - struct mtd_oob_ops ops; + struct mtd_oob_ops ops = { }; int rgn; printk(KERN_INFO "Scanning device for bad blocks\n"); --- a/drivers/mtd/nand/raw/nand_bbt.c +++ b/drivers/mtd/nand/raw/nand_bbt.c @@ -313,7 +313,7 @@ static int scan_read_oob(struct nand_chi size_t len) { struct mtd_info *mtd = nand_to_mtd(this); - struct mtd_oob_ops ops; + struct mtd_oob_ops ops = { }; int res, ret = 0; ops.mode = MTD_OPS_PLACE_OOB; @@ -354,7 +354,7 @@ static int scan_write_bbt(struct nand_ch uint8_t *buf, uint8_t *oob) { struct mtd_info *mtd = nand_to_mtd(this); - struct mtd_oob_ops ops; + struct mtd_oob_ops ops = { }; ops.mode = MTD_OPS_PLACE_OOB; ops.ooboffs = 0; @@ -416,7 +416,7 @@ static int scan_block_fast(struct nand_c { struct mtd_info *mtd = nand_to_mtd(this); - struct mtd_oob_ops ops; + struct mtd_oob_ops ops = { }; int ret, page_offset; ops.ooblen = mtd->oobsize; @@ -756,7 +756,7 @@ static int write_bbt(struct nand_chip *t uint8_t rcode = td->reserved_block_code; size_t retlen, len = 0; loff_t to; - struct mtd_oob_ops ops; + struct mtd_oob_ops ops = { }; ops.ooblen = mtd->oobsize; ops.ooboffs = 0; --- a/drivers/mtd/nand/raw/sm_common.c +++ b/drivers/mtd/nand/raw/sm_common.c @@ -99,7 +99,7 @@ static const struct mtd_ooblayout_ops oo static int sm_block_markbad(struct nand_chip *chip, loff_t ofs) { struct mtd_info *mtd = nand_to_mtd(chip); - struct mtd_oob_ops ops; + struct mtd_oob_ops ops = { }; struct sm_oob oob; int ret; --- a/drivers/mtd/nftlcore.c +++ b/drivers/mtd/nftlcore.c @@ -124,7 +124,7 @@ int nftl_read_oob(struct mtd_info *mtd, size_t *retlen, uint8_t *buf) { loff_t mask = mtd->writesize - 1; - struct mtd_oob_ops ops; + struct mtd_oob_ops ops = { }; int res; ops.mode = MTD_OPS_PLACE_OOB; @@ -145,7 +145,7 @@ int nftl_write_oob(struct mtd_info *mtd, size_t *retlen, uint8_t *buf) { loff_t mask = mtd->writesize - 1; - struct mtd_oob_ops ops; + struct mtd_oob_ops ops = { }; int res; ops.mode = MTD_OPS_PLACE_OOB; @@ -168,7 +168,7 @@ static int nftl_write(struct mtd_info *m size_t *retlen, uint8_t *buf, uint8_t *oob) { loff_t mask = mtd->writesize - 1; - struct mtd_oob_ops ops; + struct mtd_oob_ops ops = { }; int res; ops.mode = MTD_OPS_PLACE_OOB; --- a/drivers/mtd/sm_ftl.c +++ b/drivers/mtd/sm_ftl.c @@ -239,7 +239,7 @@ static int sm_read_sector(struct sm_ftl uint8_t *buffer, struct sm_oob *oob) { struct mtd_info *mtd = ftl->trans->mtd; - struct mtd_oob_ops ops; + struct mtd_oob_ops ops = { }; struct sm_oob tmp_oob; int ret = -EIO; int try = 0; @@ -323,7 +323,7 @@ static int sm_write_sector(struct sm_ftl int zone, int block, int boffset, uint8_t *buffer, struct sm_oob *oob) { - struct mtd_oob_ops ops; + struct mtd_oob_ops ops = { }; struct mtd_info *mtd = ftl->trans->mtd; int ret; --- a/drivers/mtd/ssfdc.c +++ b/drivers/mtd/ssfdc.c @@ -163,7 +163,7 @@ static int read_physical_sector(struct m /* Read redundancy area (wrapper to MTD_READ_OOB */ static int read_raw_oob(struct mtd_info *mtd, loff_t offs, uint8_t *buf) { - struct mtd_oob_ops ops; + struct mtd_oob_ops ops = { }; int ret; ops.mode = MTD_OPS_RAW; --- a/drivers/mtd/tests/nandbiterrs.c +++ b/drivers/mtd/tests/nandbiterrs.c @@ -99,7 +99,7 @@ static int write_page(int log) static int rewrite_page(int log) { int err = 0; - struct mtd_oob_ops ops; + struct mtd_oob_ops ops = { }; if (log) pr_info("rewrite page\n"); --- a/drivers/mtd/tests/oobtest.c +++ b/drivers/mtd/tests/oobtest.c @@ -56,7 +56,7 @@ static void do_vary_offset(void) static int write_eraseblock(int ebnum) { int i; - struct mtd_oob_ops ops; + struct mtd_oob_ops ops = { }; int err = 0; loff_t addr = (loff_t)ebnum * mtd->erasesize; @@ -165,7 +165,7 @@ static size_t memffshow(loff_t addr, lof static int verify_eraseblock(int ebnum) { int i; - struct mtd_oob_ops ops; + struct mtd_oob_ops ops = { }; int err = 0; loff_t addr = (loff_t)ebnum * mtd->erasesize; size_t bitflips; @@ -260,7 +260,7 @@ static int verify_eraseblock(int ebnum) static int verify_eraseblock_in_one_go(int ebnum) { - struct mtd_oob_ops ops; + struct mtd_oob_ops ops = { }; int err = 0; loff_t addr = (loff_t)ebnum * mtd->erasesize; size_t len = mtd->oobavail * pgcnt; @@ -338,7 +338,7 @@ static int __init mtd_oobtest_init(void) int err = 0; unsigned int i; uint64_t tmp; - struct mtd_oob_ops ops; + struct mtd_oob_ops ops = { }; loff_t addr = 0, addr0; printk(KERN_INFO "\n"); --- a/drivers/mtd/tests/readtest.c +++ b/drivers/mtd/tests/readtest.c @@ -47,7 +47,7 @@ static int read_eraseblock_by_page(int e err = ret; } if (mtd->oobsize) { - struct mtd_oob_ops ops; + struct mtd_oob_ops ops = { }; ops.mode = MTD_OPS_PLACE_OOB; ops.len = 0; --- a/fs/jffs2/wbuf.c +++ b/fs/jffs2/wbuf.c @@ -1035,7 +1035,7 @@ int jffs2_check_oob_empty(struct jffs2_s { int i, ret; int cmlen = min_t(int, c->oobavail, OOB_CM_SIZE); - struct mtd_oob_ops ops; + struct mtd_oob_ops ops = { }; ops.mode = MTD_OPS_AUTO_OOB; ops.ooblen = NR_OOB_SCAN_PAGES * c->oobavail; @@ -1076,7 +1076,7 @@ int jffs2_check_oob_empty(struct jffs2_s int jffs2_check_nand_cleanmarker(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb) { - struct mtd_oob_ops ops; + struct mtd_oob_ops ops = { }; int ret, cmlen = min_t(int, c->oobavail, OOB_CM_SIZE); ops.mode = MTD_OPS_AUTO_OOB; @@ -1101,7 +1101,7 @@ int jffs2_write_nand_cleanmarker(struct struct jffs2_eraseblock *jeb) { int ret; - struct mtd_oob_ops ops; + struct mtd_oob_ops ops = { }; int cmlen = min_t(int, c->oobavail, OOB_CM_SIZE); ops.mode = MTD_OPS_AUTO_OOB;