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

[Christophe JAILLET]

'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: 54309d657767 ("mtd: rawnand: fsl_upm: Implement exec_op()")
Signed-off-by: Christophe JAILLET <christophe.jaillet@xxxxxxxxxx>
---
 drivers/mtd/nand/raw/fsl_upm.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/mtd/nand/raw/fsl_upm.c b/drivers/mtd/nand/raw/fsl_upm.c
index f1810e2f2c07..0c67fd1347c4 100644
--- a/drivers/mtd/nand/raw/fsl_upm.c
+++ b/drivers/mtd/nand/raw/fsl_upm.c
@@ -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)
-- 
2.34.1