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net: fix skb leak in __skb_tstamp_tx()

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commit 8a02fb71d7 upstream.

Commit 50749f2dd6 ("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: 50749f2dd6 ("tcp/udp: Fix memleaks of sk and zerocopy skbs with TX timestamp.")
Signed-off-by: Pratyush Yadav <ptyadav@amazon.de>
Reviewed-by: Kuniyuki Iwashima <kuniyu@amazon.com>
Reviewed-by: Willem de Bruijn <willemb@google.com>
Link: https://lore.kernel.org/r/20230522153020.32422-1-ptyadav@amazon.de
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Pratyush Yadav
2023-05-22 17:30:20 +02:00
committed by Greg Kroah-Hartman
parent 8a30dce9d7
commit a594382ec6
1 changed files with 3 additions and 1 deletions
Download Patch File Download Diff File Expand all files Collapse all files
net/core/skbuff.c
+3 -1
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@@ -4751,8 +4751,10 @@ 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;