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authorColin Ian King <colin.king@canonical.com>2017-11-08 19:13:23 +0300
committerBoris Brezillon <boris.brezillon@free-electrons.com>2017-12-18 15:30:04 +0300
commitb1d030f804fbf8f502756231d475fcf8fd6a86ad (patch)
treed3114c6ab32e1e67840f5cfb0ae0104886deb9bc /drivers/mtd/parsers
parent9e343e87d2c4c707ef8fae2844864d4dde3a2d13 (diff)
downloadlinux-b1d030f804fbf8f502756231d475fcf8fd6a86ad.tar.xz
mtd: sharpslpart: fix overflow on block_adr calculation
Multiplying block_num and mtd->erasesize may potentially overflow as they are both unsigned ints and so the multiplication is evaluated in unsigned int arithmetic. Cast block_adr to off_t to ensure multiplication is off_t sized to avoid any potential overflow. Detected by CoverityScan, CID#1461264 ("Unintentional integer overflow") Signed-off-by: Colin Ian King <colin.king@canonical.com> Acked-by: Andrea Adami <andrea.adami@gmail.com> Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
Diffstat (limited to 'drivers/mtd/parsers')
-rw-r--r--drivers/mtd/parsers/sharpslpart.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/drivers/mtd/parsers/sharpslpart.c b/drivers/mtd/parsers/sharpslpart.c
index 5fe0079ea5ed..0ddb79ac390d 100644
--- a/drivers/mtd/parsers/sharpslpart.c
+++ b/drivers/mtd/parsers/sharpslpart.c
@@ -192,7 +192,7 @@ static int sharpsl_nand_init_ftl(struct mtd_info *mtd, struct sharpsl_ftl *ftl)
/* create physical-logical table */
for (block_num = 0; block_num < phymax; block_num++) {
- block_adr = block_num * mtd->erasesize;
+ block_adr = (loff_t)block_num * mtd->erasesize;
if (mtd_block_isbad(mtd, block_adr))
continue;
@@ -244,7 +244,7 @@ static int sharpsl_nand_read_laddr(struct mtd_info *mtd,
return -EINVAL;
block_num = ftl->log2phy[log_num];
- block_adr = block_num * mtd->erasesize;
+ block_adr = (loff_t)block_num * mtd->erasesize;
block_ofs = mtd_mod_by_eb((u32)from, mtd);
err = mtd_read(mtd, block_adr + block_ofs, len, &retlen, buf);