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 9AA205012A9 for ; Wed, 30 Sep 2026 15:13:04 +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=1790781193; cv=none; b=HfEIYxryMlAaSkcBg+98uq4vcdbjiMtyb87zxH6Xf8ATQwWX8BwO7Zf1sD1VsqFRU+/XUTZGOFgr6djJSrU/5GvKSiHO7bjlsn1dcnWUueUMzMvk5RUc8SFYUd2DSAu6DX+uKP4WpQ5mdE2aeLUTVX5EEbpKjxwZ/zEyfumgJ6I= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1790781193; c=relaxed/simple; bh=Dx+cPy859z6nECF2g9JBRqCY6CpDT7hfZqnOdcspvrY=; h=Subject:To:Cc:From:Date:Message-ID:MIME-Version:Content-Type; b=QmG/sjjXmyEzId2F4zVCDmgGdeOej73OUy8ghsGmO+UYm7DVaQd/N7a7dJM9+PNIWqo3rtQxkIAMCSYHYVyC4i6EYB+GEtQSakGoxfLlU02EahsaDNYTgHn199fyVv05LxBhFSSI9vCPHxT3nWWjETXaEWCTz7J4wWJtTygLW5w= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=HSJmbBlx; 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="HSJmbBlx" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 75D5F1F000FF; Wed, 30 Sep 2026 15:12:58 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1790781179; bh=VtilQsaO3o0hJCRAn9JraiRezasWMvZ5PwDug0RpMgs=; h=Subject:To:Cc:From:Date; b=HSJmbBlxdYO6qeLgveWtuGZR8T+OOGg+c8wruc/zdgDj1p4suKghphf0fFVyOeLZ9 6zOBTzkkkWG3ZVJEtOEZHT4XH4Aa50tic7VcFNIB4FDm+fbB6SeE+k63Tunol2F3AK mEuXYYVmGgHuYp8nfMCTauoUtAuOUbT4bKNTXWl0= Subject: FAILED: patch "[PATCH] net: vxlan: prevent NULL deref in vxlan_xmit_one" failed to apply to 6.1-stable tree To: atenart@kernel.org,b.galvani@gmail.com,idosch@nvidia.com,kuba@kernel.org,liali@redhat.com Cc: From: Date: Wed, 30 Sep 2026 17:12:53 +0200 Message-ID: <2026093052-grimace-mutilated-514b@gregkh> Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=ANSI_X3.4-1968 Content-Transfer-Encoding: 8bit The patch below does not apply to the 6.1-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to . To reproduce the conflict and resubmit, you may use the following commands: git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-6.1.y git checkout FETCH_HEAD git cherry-pick -x 1f73a56f986005f0bc64ed23873930e2ee4f5911 # git commit -s git send-email --to '' --in-reply-to '2026093052-grimace-mutilated-514b@gregkh' --subject-prefix 'PATCH 6.1.y' 'HEAD^..' Possible dependencies: thanks, greg k-h ------------------ original commit in Linus's tree ------------------ >From 1f73a56f986005f0bc64ed23873930e2ee4f5911 Mon Sep 17 00:00:00 2001 From: Antoine Tenart Date: Wed, 26 Nov 2025 11:26:25 +0100 Subject: [PATCH] net: vxlan: prevent NULL deref in vxlan_xmit_one Neither sock4 nor sock6 pointers are guaranteed to be non-NULL in vxlan_xmit_one, e.g. if the iface is brought down. This can lead to the following NULL dereference: BUG: kernel NULL pointer dereference, address: 0000000000000010 Oops: Oops: 0000 [#1] SMP NOPTI RIP: 0010:vxlan_xmit_one+0xbb3/0x1580 Call Trace: vxlan_xmit+0x429/0x610 dev_hard_start_xmit+0x55/0xa0 __dev_queue_xmit+0x6d0/0x7f0 ip_finish_output2+0x24b/0x590 ip_output+0x63/0x110 Mentioned commits changed the code path in vxlan_xmit_one and as a side effect the sock4/6 pointer validity checks in vxlan(6)_get_route were lost. Fix this by adding back checks. Since both commits being fixed were released in the same version (v6.7) and are strongly related, bundle the fixes in a single commit. Reported-by: Liang Li Fixes: 6f19b2c136d9 ("vxlan: use generic function for tunnel IPv4 route lookup") Fixes: 2aceb896ee18 ("vxlan: use generic function for tunnel IPv6 route lookup") Cc: Beniamino Galvani Signed-off-by: Antoine Tenart Reviewed-by: Ido Schimmel Tested-by: Ido Schimmel Link: https://patch.msgid.link/20251126102627.74223-1-atenart@kernel.org Signed-off-by: Jakub Kicinski diff --git a/drivers/net/vxlan/vxlan_core.c b/drivers/net/vxlan/vxlan_core.c index a5c55e7e4d79..e957aa12a8a4 100644 --- a/drivers/net/vxlan/vxlan_core.c +++ b/drivers/net/vxlan/vxlan_core.c @@ -2349,7 +2349,7 @@ void vxlan_xmit_one(struct sk_buff *skb, struct net_device *dev, int addr_family; __u8 tos, ttl; int ifindex; - int err; + int err = 0; u32 flags = vxlan->cfg.flags; bool use_cache; bool udp_sum = false; @@ -2454,12 +2454,18 @@ void vxlan_xmit_one(struct sk_buff *skb, struct net_device *dev, rcu_read_lock(); if (addr_family == AF_INET) { - struct vxlan_sock *sock4 = rcu_dereference(vxlan->vn4_sock); + struct vxlan_sock *sock4; u16 ipcb_flags = 0; struct rtable *rt; __be16 df = 0; __be32 saddr; + sock4 = rcu_dereference(vxlan->vn4_sock); + if (unlikely(!sock4)) { + reason = SKB_DROP_REASON_DEV_READY; + goto tx_error; + } + if (!ifindex) ifindex = sock4->sock->sk->sk_bound_dev_if; @@ -2534,10 +2540,16 @@ void vxlan_xmit_one(struct sk_buff *skb, struct net_device *dev, ipcb_flags); #if IS_ENABLED(CONFIG_IPV6) } else { - struct vxlan_sock *sock6 = rcu_dereference(vxlan->vn6_sock); + struct vxlan_sock *sock6; struct in6_addr saddr; u16 ip6cb_flags = 0; + sock6 = rcu_dereference(vxlan->vn6_sock); + if (unlikely(!sock6)) { + reason = SKB_DROP_REASON_DEV_READY; + goto tx_error; + } + if (!ifindex) ifindex = sock6->sock->sk->sk_bound_dev_if;