5.4-stable review patch. If anyone has any objections, please let me know.
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From: Ivan Stepchenko sid@itb.spb.ru
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 sid@itb.spb.ru Signed-off-by: Miquel Raynal miquel.raynal@bootlin.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/mtd/nand/onenand/onenand_base.c | 1 + 1 file changed, 1 insertion(+)
--- a/drivers/mtd/nand/onenand/onenand_base.c +++ b/drivers/mtd/nand/onenand/onenand_base.c @@ -2921,6 +2921,7 @@ static int do_otp_read(struct mtd_info * 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);