[PATCH 5.12 265/677] staging: rtl8192u: Fix potential infinite loop

From: Greg Kroah-Hartman
Date: Wed May 12 2021 - 14:44:01 EST


From: Colin Ian King <colin.king@xxxxxxxxxxxxx>

[ Upstream commit f9b9263a25dc3d2eaaa829e207434db6951ca7bc ]

The for-loop iterates with a u8 loop counter i and compares this
with the loop upper limit of riv->ieee80211->LinkDetectInfo.SlotNum
that is a u16 type. There is a potential infinite loop if SlotNum
is larger than the u8 loop counter. Fix this by making the loop
counter the same type as SlotNum.

Addresses-Coverity: ("Infinite loop")
Fixes: 8fc8598e61f6 ("Staging: Added Realtek rtl8192u driver to staging")
Signed-off-by: Colin Ian King <colin.king@xxxxxxxxxxxxx>
Link: https://lore.kernel.org/r/20210407150308.496623-1-colin.king@xxxxxxxxxxxxx
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
drivers/staging/rtl8192u/r8192U_core.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/staging/rtl8192u/r8192U_core.c b/drivers/staging/rtl8192u/r8192U_core.c
index 9fc4adc83d77..b5a313649f44 100644
--- a/drivers/staging/rtl8192u/r8192U_core.c
+++ b/drivers/staging/rtl8192u/r8192U_core.c
@@ -3210,7 +3210,7 @@ static void rtl819x_update_rxcounts(struct r8192_priv *priv, u32 *TotalRxBcnNum,
u32 *TotalRxDataNum)
{
u16 SlotIndex;
- u8 i;
+ u16 i;

*TotalRxBcnNum = 0;
*TotalRxDataNum = 0;
--
2.30.2