linux-kernel - [PATCH] bnx2x: Fix potential infinite loop

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Date:   Wed,  7 Apr 2021 15:28:02 +0100
From:   Colin King <colin.king@...onical.com>
To:     Ariel Elior <aelior@...vell.com>,
        Sudarsana Kalluru <skalluru@...vell.com>,
        GR-everest-linux-l2@...vell.com,
        "David S . Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Eilon Greenstein <eilong@...adcom.com>, netdev@...r.kernel.org
Cc:     kernel-janitors@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] bnx2x: Fix potential infinite loop

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

The for_each_tx_queue loop iterates with a u8 loop counter i and
compares this with the loop upper limit of bp->num_queues that
is an int type.  There is a potential infinite loop if bp->num_queues
is larger than the u8 loop counter. Fix this by making the loop
counter the same type as bp->num_queues.

Addresses-Coverity: ("Infinite loop")
Fixes: ad5afc89365e ("bnx2x: Separate VF and PF logic")
Signed-off-by: Colin Ian King <colin.king@...onical.com>
---
 drivers/net/ethernet/broadcom/bnx2x/bnx2x_cmn.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/broadcom/bnx2x/bnx2x_cmn.c b/drivers/net/ethernet/broadcom/bnx2x/bnx2x_cmn.c
index 1a6ec1a12d53..edfbeb710ad4 100644
--- a/drivers/net/ethernet/broadcom/bnx2x/bnx2x_cmn.c
+++ b/drivers/net/ethernet/broadcom/bnx2x/bnx2x_cmn.c
@@ -2959,7 +2959,8 @@ int bnx2x_nic_load(struct bnx2x *bp, int load_mode)
 
 int bnx2x_drain_tx_queues(struct bnx2x *bp)
 {
-	u8 rc = 0, cos, i;
+	u8 rc = 0, cos;
+	int i;
 
 	/* Wait until tx fastpath tasks complete */
 	for_each_tx_queue(bp, i) {
-- 
2.30.2