linux-kernel - [PATCH] staging: rtl8192u: Fix potential infinite loop

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Message-Id: <20210407150308.496623-1-colin.king@canonical.com>
Date:   Wed,  7 Apr 2021 16:03:08 +0100
From:   Colin King <colin.king@...onical.com>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        linux-staging@...ts.linux.dev
Cc:     kernel-janitors@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] staging: rtl8192u: Fix potential infinite loop

From: Colin Ian King <colin.king@...onical.com>

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@...onical.com>
---
 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