The function do_otp_read() does not set the output parameter *retlen, which is expected to contain the number of bytes actually read. As a result, in onenand_otp_walk(), the tmp_retlen variable remains uninitialized after calling do_otp_walk() and used to change the values of the buf, len and retlen variables.

Found by Linux Verification Center (linuxtesting.org) with SVACE.

Fixes: 49dc08eeda70 ("[MTD] [OneNAND] fix numerous races") Cc: stable@vger.kernel.org Signed-off-by: Ivan Stepchenko sid@itb.spb.ru --- drivers/mtd/nand/onenand/onenand_base.c | 1 + 1 file changed, 1 insertion(+)

diff --git a/drivers/mtd/nand/onenand/onenand_base.c b/drivers/mtd/nand/onenand/onenand_base.c index f66385faf631..0dc2ea4fc857 100644 --- a/drivers/mtd/nand/onenand/onenand_base.c +++ b/drivers/mtd/nand/onenand/onenand_base.c @@ -2923,6 +2923,7 @@ static int do_otp_read(struct mtd_info *mtd, loff_t from, size_t len, ret = ONENAND_IS_4KB_PAGE(this) ? onenand_mlc_read_ops_nolock(mtd, from, &ops) : onenand_read_ops_nolock(mtd, from, &ops); + *retlen = ops.retlen;

/* Exit OTP access mode */ this->command(mtd, ONENAND_CMD_RESET, 0, 0);