[lvc-project] [PATCH v2] net: fealnx: fix possible 'card_idx' integer overflow in

[Ilya Krutskih]

'card_idx' can be overflowed when fealnx_init_one() will be called more than
INT_MAX times. Check before incremention is required.

Fixes: 15c037d6423e ("fealnx: Move the Myson driver")
Cc: stable at vger.kernel.org # v5.10+
Signed-off-by: Ilya Krutskih <devsec at tpz.ru>
---
 drivers/net/ethernet/fealnx.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/fealnx.c b/drivers/net/ethernet/fealnx.c
index 6ac8547ef9b8..7eb6e42b4551 100644
--- a/drivers/net/ethernet/fealnx.c
+++ b/drivers/net/ethernet/fealnx.c
@@ -489,7 +489,10 @@ static int fealnx_init_one(struct pci_dev *pdev,
 	int bar = 1;
 #endif
 
-	card_idx++;
+	if (card_idx == INT_MAX)
+		return -EINVAL;
+	else
+		card_idx++;
 	sprintf(boardname, "fealnx%d", card_idx);
 
 	option = card_idx < MAX_UNITS ? options[card_idx] : 0;
-- 
2.43.0