From: Ivan Stepchenko Date: Thu, 14 Nov 2024 13:29:51 +0000 (+0300) Subject: mtd: onenand: Fix uninitialized retlen in do_otp_read() X-Git-Tag: v5.10.235~245 X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=e39e79589667cb68bf6e9f01a8a7b5d5a071d4d7;p=thirdparty%2Fkernel%2Fstable.git mtd: onenand: Fix uninitialized retlen in do_otp_read() commit 70a71f8151b9879b0950668ce3ad76263261fee0 upstream. 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 Signed-off-by: Miquel Raynal Signed-off-by: Greg Kroah-Hartman --- diff --git a/drivers/mtd/nand/onenand/onenand_base.c b/drivers/mtd/nand/onenand/onenand_base.c index 188b8061e1f79..7ac3f498709d7 100644 --- a/drivers/mtd/nand/onenand/onenand_base.c +++ b/drivers/mtd/nand/onenand/onenand_base.c @@ -2916,6 +2916,7 @@ 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);