netdev - [PATCH net] net/x25: Fix skb leak in x25_lapb_receive

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Date:   Mon, 14 Nov 2022 11:05:19 +0000
From:   Wei Yongjun <weiyongjun@...weicloud.com>
To:     Martin Schiller <ms@....tdt.de>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Andrew Hendry <andrew.hendry@...il.com>,
        Matthew Daley <mattjd@...il.com>
Cc:     Wei Yongjun <weiyongjun1@...wei.com>, linux-x25@...r.kernel.org,
        netdev@...r.kernel.org
Subject: [PATCH net] net/x25: Fix skb leak in x25_lapb_receive_frame()

From: Wei Yongjun <weiyongjun1@...wei.com>

x25_lapb_receive_frame() using skb_copy() to get a private copy of
skb, the new skb should be freed in the undersized/fragmented skb
error handling path. Otherwise there is a memory leak.

Fixes: cb101ed2c3c7 ("x25: Handle undersized/fragmented skbs")
Signed-off-by: Wei Yongjun <weiyongjun1@...wei.com>
---
 net/x25/x25_dev.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/x25/x25_dev.c b/net/x25/x25_dev.c
index 5259ef8f5242..748d8630ab58 100644
--- a/net/x25/x25_dev.c
+++ b/net/x25/x25_dev.c
@@ -117,7 +117,7 @@ int x25_lapb_receive_frame(struct sk_buff *skb, struct net_device *dev,
 
 	if (!pskb_may_pull(skb, 1)) {
 		x25_neigh_put(nb);
-		return 0;
+		goto drop;
 	}
 
 	switch (skb->data[0]) {
-- 
2.34.1