[PATCH 5.9 472/757] mtd: rawnand: stm32_fmc2: fix a buffer overflow

[Greg Kroah-Hartman]

From: Christophe Kerello <christophe.kerello@xxxxxx>

[ Upstream commit ab16f54ef3cdb6bbc06a36f636a89e6db8a6cea3 ]

This patch solves following static checker warning:
drivers/mtd/nand/raw/stm32_fmc2_nand.c:350 stm32_fmc2_nfc_select_chip()
error: buffer overflow 'nfc->data_phys_addr' 2 <= 2

The CS value can only be 0 or 1.

Signed-off-by: Christophe Kerello <christophe.kerello@xxxxxx>
Fixes: 2cd457f328c1 ("mtd: rawnand: stm32_fmc2: add STM32 FMC2 NAND flash controller driver")
Signed-off-by: Miquel Raynal <miquel.raynal@xxxxxxxxxxx>
Link: https://lore.kernel.org/linux-mtd/1595325127-32693-1-git-send-email-christophe.kerello@xxxxxx
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
 drivers/mtd/nand/raw/stm32_fmc2_nand.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/mtd/nand/raw/stm32_fmc2_nand.c b/drivers/mtd/nand/raw/stm32_fmc2_nand.c
index 7f4546ae91303..5792fb240cb2b 100644
--- a/drivers/mtd/nand/raw/stm32_fmc2_nand.c
+++ b/drivers/mtd/nand/raw/stm32_fmc2_nand.c
@@ -1762,7 +1762,7 @@ static int stm32_fmc2_nfc_parse_child(struct stm32_fmc2_nfc *nfc,
 			return ret;
 		}
 
-		if (cs > FMC2_MAX_CE) {
+		if (cs >= FMC2_MAX_CE) {
 			dev_err(nfc->dev, "invalid reg value: %d\n", cs);
 			return -EINVAL;
 		}
-- 
2.25.1