From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 218A8611B for ; Sun, 28 May 2023 19:49:42 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id A6970C433EF; Sun, 28 May 2023 19:49:41 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1685303382; bh=wZpaknrifFmpdgcrU9hAWsssO5BucnPYkxKGun6C7qM=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=0SL4iluaLR2osWo4tT/EtMH9WTLficsgf3U8dk8MkvQQWHccqN/xC8ad80R0pQDB0 PLlHagm21BtLDOZ6g3jCW5EBFTMVx5sOcSjM3FSqFslEq9lvC9Wtsdv3AYi5DOFtzY Yl6FtZAYg2DAonGsqURdgRHf9Bbi9MF5gACzBz8I= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Pratyush Yadav , Kuniyuki Iwashima , Willem de Bruijn , Jakub Kicinski Subject: [PATCH 5.15 36/69] net: fix skb leak in __skb_tstamp_tx() Date: Sun, 28 May 2023 20:11:56 +0100 Message-Id: <20230528190829.709700506@linuxfoundation.org> X-Mailer: git-send-email 2.40.1 In-Reply-To: <20230528190828.358612414@linuxfoundation.org> References: <20230528190828.358612414@linuxfoundation.org> User-Agent: quilt/0.67 Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit From: Pratyush Yadav 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(-) --- a/net/core/skbuff.c +++ b/net/core/skbuff.c @@ -4961,8 +4961,10 @@ void __skb_tstamp_tx(struct sk_buff *ori } 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;