netdev - [PATCH net 1/8] can: can327: can327_feed_frame_to_netdev(): fix potential skb leak when netdev is down

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Date:   Thu, 24 Nov 2022 20:57:01 +0100
From:   Marc Kleine-Budde <mkl@...gutronix.de>
To:     netdev@...r.kernel.org
Cc:     davem@...emloft.net, kuba@...nel.org, linux-can@...r.kernel.org,
        kernel@...gutronix.de, Ziyang Xuan <william.xuanziyang@...wei.com>,
        Max Staudt <max@...as.org>, stable@...r.kernel.org,
        Marc Kleine-Budde <mkl@...gutronix.de>
Subject: [PATCH net 1/8] can: can327: can327_feed_frame_to_netdev(): fix potential skb leak when netdev is down

From: Ziyang Xuan <william.xuanziyang@...wei.com>

In can327_feed_frame_to_netdev(), it did not free the skb when netdev
is down, and all callers of can327_feed_frame_to_netdev() did not free
allocated skb too. That would trigger skb leak.

Fix it by adding kfree_skb() in can327_feed_frame_to_netdev() when netdev
is down. Not tested, just compiled.

Fixes: 43da2f07622f ("can: can327: CAN/ldisc driver for ELM327 based OBD-II adapters")
Signed-off-by: Ziyang Xuan <william.xuanziyang@...wei.com>
Link: https://lore.kernel.org/all/20221110061437.411525-1-william.xuanziyang@huawei.com
Reviewed-by: Max Staudt <max@...as.org>
Cc: stable@...r.kernel.org
Signed-off-by: Marc Kleine-Budde <mkl@...gutronix.de>
---
 drivers/net/can/can327.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/net/can/can327.c b/drivers/net/can/can327.c
index 094197780776..ed3d0b8989a0 100644
--- a/drivers/net/can/can327.c
+++ b/drivers/net/can/can327.c
@@ -263,8 +263,10 @@ static void can327_feed_frame_to_netdev(struct can327 *elm, struct sk_buff *skb)
 {
 	lockdep_assert_held(&elm->lock);
 
-	if (!netif_running(elm->dev))
+	if (!netif_running(elm->dev)) {
+		kfree_skb(skb);
 		return;
+	}
 
 	/* Queue for NAPI pickup.
 	 * rx-offload will update stats and LEDs for us.

base-commit: ad17c2a3f11b0f6b122e7842d8f7d9a5fcc7ac63
-- 
2.35.1