From af183bf726490a512150044f42bf1a1755ca7fb2 Mon Sep 17 00:00:00 2001 From: Pratyush Yadav Date: Mon, 22 May 2023 17:30:20 +0200 Subject: [PATCH] net: fix skb leak in __skb_tstamp_tx() commit 8a02fb71d7192ff1a9a47c9d937624966c6e09af upstream. Commit 50749f2dd685 ("tcp/udp: Fix memleaks of sk and zerocopy skbs with TX timestamp.") added a call to skb_orphan_frags_rx() to fix leaks with zerocopy skbs. But it ended up adding a leak of its own. When skb_orphan_frags_rx() fails, the function just returns, leaking the skb it just cloned. Free it before returning. This bug was discovered and resolved using Coverity Static Analysis Security Testing (SAST) by Synopsys, Inc. Fixes: 50749f2dd685 ("tcp/udp: Fix memleaks of sk and zerocopy skbs with TX timestamp.") Signed-off-by: Pratyush Yadav Reviewed-by: Kuniyuki Iwashima Reviewed-by: Willem de Bruijn Link: https://lore.kernel.org/r/20230522153020.32422-1-ptyadav@amazon.de Signed-off-by: Jakub Kicinski Signed-off-by: Greg Kroah-Hartman --- net/core/skbuff.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/net/core/skbuff.c b/net/core/skbuff.c index e37830ef2a4b9..ef9772b12624c 100644 --- a/net/core/skbuff.c +++ b/net/core/skbuff.c @@ -4983,8 +4983,10 @@ void __skb_tstamp_tx(struct sk_buff *orig_skb, } else { skb = skb_clone(orig_skb, GFP_ATOMIC); - if (skb_orphan_frags_rx(skb, GFP_ATOMIC)) + if (skb_orphan_frags_rx(skb, GFP_ATOMIC)) { + kfree_skb(skb); return; + } } if (!skb) return; -- 2.39.5