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 ED30A27CB12; Wed, 23 Apr 2025 14:45:58 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1745419559; cv=none; b=VeltbYtY0C+ykozpmbTWya7yRxL63hhVjVBgZXaw/dwIcKZJkZS+5RoS/5UXQHUobnpdaE/Fka22znA6Jp1BbpDZpkfp20jNbcnGHBsh/vnxjcjPpK7H2hg3y5XoU4vtT5lFwFBkvuuJr5zNyohUaXT7FY4a3HcuUqeRIcFhm9k= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1745419559; c=relaxed/simple; bh=tJ6xMqH/0uPkZckafKJXR9aY5Scui95suLGLxdQS4xI=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=dmMTfuLFBQoCSf0+gJAqvL3CjaXDsnyz4eIW+d8l86JJHBFYlshrgoJCCc8/zu1FKna8Or8ODdfVFGlsSPio1ZosX+g2VRy7u2S1gU0zSXPmAFAWsJ7hiWgi07T1s7U1zM6GNNiPyqrfLTA8a+AwwYXzW5pz52QJ5HjAqd9upV8= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=aXULMPi7; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="aXULMPi7" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 120D1C4CEE2; Wed, 23 Apr 2025 14:45:57 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1745419558; bh=tJ6xMqH/0uPkZckafKJXR9aY5Scui95suLGLxdQS4xI=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=aXULMPi7FAxdcd5bqLYityKN+MOzhrGeqMj6tnK2Ex2FQ+iFSpHmqvLEmS9RmdVIA c92CzvwnHj7i1IHsnXO7CbJxXYMTdLPTys0HPkFSxpy9uQHEJD7uPO1Jw/H8TWjkDq n3y35s+xFyIN5t6fKdW+7AfTJwc+9dP7EVU7Qgj0= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Tung Nguyen , Paolo Abeni , Sasha Levin Subject: [PATCH 6.1 003/291] tipc: fix memory leak in tipc_link_xmit Date: Wed, 23 Apr 2025 16:39:52 +0200 Message-ID: <20250423142624.553617758@linuxfoundation.org> X-Mailer: git-send-email 2.49.0 In-Reply-To: <20250423142624.409452181@linuxfoundation.org> References: <20250423142624.409452181@linuxfoundation.org> User-Agent: quilt/0.68 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 6.1-stable review patch. If anyone has any objections, please let me know. ------------------ From: Tung Nguyen [ Upstream commit 69ae94725f4fc9e75219d2d69022029c5b24bc9a ] In case the backlog transmit queue for system-importance messages is overloaded, tipc_link_xmit() returns -ENOBUFS but the skb list is not purged. This leads to memory leak and failure when a skb is allocated. This commit fixes this issue by purging the skb list before tipc_link_xmit() returns. Fixes: 365ad353c256 ("tipc: reduce risk of user starvation during link congestion") Signed-off-by: Tung Nguyen Link: https://patch.msgid.link/20250403092431.514063-1-tung.quang.nguyen@est.tech Signed-off-by: Paolo Abeni Signed-off-by: Sasha Levin --- net/tipc/link.c | 1 + 1 file changed, 1 insertion(+) diff --git a/net/tipc/link.c b/net/tipc/link.c index 8715c9b05f90d..d6a8f0aa531bd 100644 --- a/net/tipc/link.c +++ b/net/tipc/link.c @@ -1068,6 +1068,7 @@ int tipc_link_xmit(struct tipc_link *l, struct sk_buff_head *list, if (unlikely(l->backlog[imp].len >= l->backlog[imp].limit)) { if (imp == TIPC_SYSTEM_IMPORTANCE) { pr_warn("%s<%s>, link overflow", link_rst_msg, l->name); + __skb_queue_purge(list); return -ENOBUFS; } rc = link_schedule_user(l, hdr); -- 2.39.5