From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (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 7DEE3455631; Fri, 9 Oct 2026 14:20:31 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1791555643; cv=none; b=dSorCrVTx/iy5bLYGPvFsQyeAn/b1fkgcrzrB+eQxcisoduw/tDLcU+6PXATViZZnpj9yxabm/jSkOl9/KdJ/dD91I7b8J7WZb5KvprE/P6wXdEsP+0bzTeHqom0SzU3x26w0qliAVEAAXczDS9EKcNps8Rd57BVotEnJRST0T8= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1791555643; c=relaxed/simple; bh=6TnX4GOEQMe8SCZlDmAU+Pl83pi6Ettgm2nIvgwahEc=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=Y2vVEFWA6dCDeixDtTz8vJgZkTod7TBCPBUFpY3OzRC+0AGPg+OFuQxm1Gb5pS1TKPRpl9tp4FWSGG/KgTIVz/dn7DMVscoM6p2qLnJQ+OxTPwedNK8xsVV4d+MayR4+508OSKW1k73rK9C2Hu/JQ7UD0nUOa7NzUI41+ekXYxE= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=SS9k9nTn; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="SS9k9nTn" Received: by smtp.kernel.org (Postfix) with ESMTPSA id D28B01F00898; Fri, 9 Oct 2026 14:20:30 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1791555631; bh=zY/BPr8Jg5mPInVJ5+9aji7dVSWzP920xkoYCDylbpY=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=SS9k9nTnj9q98PaCVJmiPk3emcbW99sq7drPcRMbRvDaANJ+bsu+WGjdafhWPGO+7 rwKFIWAWwB+DTGDXrwcvheUK97UWpA2R+rdTDUMlWAP7WTV92kJV5Y27PHh4nOMWxb T+iRyk3AydGoFJgUqTkpvD+hzx9EcDO9ZiNJ/LnA= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Xuanqiang Luo , Simon Horman , Paolo Abeni Subject: [PATCH 7.2 040/428] pfcp: fix socket lifetime on netdevice registration failure Date: Fri, 9 Oct 2026 16:06:17 +0200 Message-ID: <20261009140946.975434019@linuxfoundation.org> X-Mailer: git-send-email 2.56.0 In-Reply-To: <20261009140946.008206689@linuxfoundation.org> References: <20261009140946.008206689@linuxfoundation.org> User-Agent: quilt/0.69 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 7.2-stable review patch. If anyone has any objections, please let me know. ------------------ From: Xuanqiang Luo commit 0f17d2e3dd9cda3ee6d94033d5e5489af168920d upstream. pfcp_newlink() creates the UDP socket before register_netdevice(). If registration fails after pfcp_dev_init() succeeds, the core calls pfcp_dev_uninit(), which releases the socket and clears pfcp->sk. The newlink error path then releases it again, causing a NULL pointer dereference. This was observed with failslab fault injection: FAULT_INJECTION: forcing a failure. kobject: kobject_add_internal failed for pfcp0 (error: -12 parent: net) BUG: KASAN: null-ptr-deref in udp_tunnel_sock_release+0x1c/0x50 Read of size 8 at addr 0000000000000120 by task ip/1037 Call trace: show_stack+0x18/0x24 (C) dump_stack_lvl+0x78/0x90 print_report+0x468/0x5cc kasan_report+0xa4/0xf0 __asan_load8+0x7c/0xd0 udp_tunnel_sock_release+0x1c/0x50 pfcp_newlink+0x128/0x184 rtnl_newlink+0x848/0xe44 rtnetlink_rcv_msg+0x468/0x514 netlink_rcv_skb+0xc0/0x1f0 rtnetlink_rcv+0x18/0x24 netlink_unicast+0x4b8/0x558 netlink_sendmsg+0x2b8/0x584 ... Return from pfcp_del_sock() if pfcp->sk is NULL. Fixes: 76c8764ef36a5 ("pfcp: add PFCP module") Cc: stable@vger.kernel.org Signed-off-by: Xuanqiang Luo Reviewed-by: Simon Horman Link: https://patch.msgid.link/20260924055252.33488-1-xuanqiang.luo@linux.dev Signed-off-by: Paolo Abeni Signed-off-by: Greg Kroah-Hartman --- drivers/net/pfcp.c | 3 +++ 1 file changed, 3 insertions(+) --- a/drivers/net/pfcp.c +++ b/drivers/net/pfcp.c @@ -104,6 +104,9 @@ drop: static void pfcp_del_sock(struct pfcp_dev *pfcp) { + if (!pfcp->sk) + return; + udp_tunnel_sock_release(pfcp->sk); pfcp->sk = NULL; }