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mtd: rawnand: fsl_upm: Fix an off-by one test in fun_exec_op() 

[ Upstream commit c6abce6033 ]

'op-cs' is copied in 'fun->mchip_number' which is used to access the
'mchip_offsets' and the 'rnb_gpio' arrays.
These arrays have NAND_MAX_CHIPS elements, so the index must be below this
limit.

Fix the sanity check in order to avoid the NAND_MAX_CHIPS value. This
would lead to out-of-bound accesses.

Fixes: 54309d6577 ("mtd: rawnand: fsl_upm: Implement exec_op()")
Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
Reviewed-by: Dan Carpenter <dan.carpenter@linaro.org>
Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Link: https://lore.kernel.org/linux-mtd/cd01cba1c7eda58bdabaae174c78c067325803d2.1689803636.git.christophe.jaillet@wanadoo.fr
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Christophe JAILLET 2023-07-19 23:55:01 +02:00 committed by Greg Kroah-Hartman
parent b71c00256d
commit f4b700c718
1 changed files with 1 additions and 1 deletions
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2
drivers/mtd/nand/raw/fsl_upm.c
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@ -135,7 +135,7 @@ static int fun_exec_op(struct nand_chip *chip, const struct nand_operation *op,
unsigned int i;
int ret;
if (op->cs > NAND_MAX_CHIPS)
if (op->cs >= NAND_MAX_CHIPS)
return -EINVAL;
if (check_only)