From nobody Mon Apr 13 21:40:01 2026 Received: from mail-ot1-f72.google.com (mail-ot1-f72.google.com [209.85.210.72]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id B0B535C613 for ; Wed, 4 Mar 2026 13:38:26 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.210.72 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1772631508; cv=none; b=OV0MLM/OqnailZAusDltiqstvaKdNoA7YfHp2+HkI5VzChpi+GKsXOfYOVUCBo/opzCAMjRx96FMSTxYVkg/ja2kMBUeUMXInYEDs+VjwuCJ428CHlK1hanZjGFiGYkId4JIOS10hw+ebL1KJ3Y/x6cd8TRaHdx9MvlgBho5a74= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1772631508; c=relaxed/simple; bh=t01rCDs7Ftci+Us81+pKEvEeintgDqb/WwKNHZh+Zo8=; h=MIME-Version:Date:In-Reply-To:Message-ID:Subject:From:To: Content-Type; b=Yu2jMako6q+thRd2B4Kohfbo3LN8ODeqggAnqVYSaCIFoALJ1dsx3sXuI9A/G0I3dasrrTTR5QQl7kZNvm2+B6+klUK7jF8IV932BLm7eYiBKMW7Gm9j6ARuTZZWHvUvI/T/bqENajZtnQ5u65NcVvrGyS5Md4+asC2EFefWYZ8= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=fail (p=none dis=none) header.from=syzkaller.appspotmail.com; spf=pass smtp.mailfrom=M3KW2WVRGUFZ5GODRSRYTGD7.apphosting.bounces.google.com; arc=none smtp.client-ip=209.85.210.72 Authentication-Results: smtp.subspace.kernel.org; dmarc=fail (p=none dis=none) header.from=syzkaller.appspotmail.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=M3KW2WVRGUFZ5GODRSRYTGD7.apphosting.bounces.google.com Received: by mail-ot1-f72.google.com with SMTP id 46e09a7af769-7d4cb985fa3so32874279a34.2 for ; Wed, 04 Mar 2026 05:38:26 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1772631505; x=1773236305; h=to:from:subject:message-id:in-reply-to:date:mime-version :x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=e0+rKtMIrOz/Z8DT7RcgePqFd6a6bLeRNg7jZZP9y/g=; b=IOslQ3MNMikKlMP4zMyHHdSHKmvFAToj3U1CCk9lfwncosPBeHlJyYjrUyWIZRalz4 xeljjxXTcWMVq8hWZWBvqJa/Zgv4T5ZFtpXW931IhUQra0vmc730kcXAW+D1JOss5q1D 0NhSGQOYLb0RPoqMCQQjYQX6Da+fAG6fEe1hMMN2agigcDMhR7sttRNbuwIRVesMcmc1 XL9nV2Xv9G3vE9mLEPVGm/4adq4gpaW3Ye4lwHF5RjZnspMJ75jTR2+vA2d1Hylo+cLD y58e7YmucecBME4EMOrDEjVMThxOfAHwix1YZMnxAmRARiLtbhyhF2CeQmUUrlOXiOMG T3kw== X-Gm-Message-State: AOJu0YyaNIPqYc/Xf4rNSoqKAIyXTix+gWdTICl7O0T9R1QtbAg2z6tz n8ksrN7RIc7vfnrEjBbVIjsgWXeNhviJCSGkRFjSTNW53VjF3IhpEhUh+oda7aq5Of6ewnHbzVw kABi8J8kWb9qc4HauNTzzfY294s+/6t70qMYluKi5IotN6sho23VW4kXl/hE= Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a4a:e918:0:b0:679:c358:8ed4 with SMTP id 006d021491bc7-67b177584b3mr1131788eaf.46.1772631505601; Wed, 04 Mar 2026 05:38:25 -0800 (PST) Date: Wed, 04 Mar 2026 05:38:25 -0800 In-Reply-To: <6996dff5.a70a0220.2c38d7.0123.GAE@google.com> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <69a835d1.a70a0220.b118c.001a.GAE@google.com> Subject: Forwarded: Don't allow device double-register From: syzbot To: linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" For archival purposes, forwarding an incoming command email to linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com. *** Subject: Don't allow device double-register Author: fw@strlen.de #syz test: https://git.kernel.org/pub/scm/linux/kernel/git/netdev/net.git = main diff --git a/net/netfilter/nf_tables_api.c b/net/netfilter/nf_tables_api.c index fd7f7e4e2a43..b0fd94427a5a 100644 --- a/net/netfilter/nf_tables_api.c +++ b/net/netfilter/nf_tables_api.c @@ -9677,8 +9677,11 @@ static int nft_flowtable_event(unsigned long event, = struct net_device *dev, kfree_rcu(ops, rcu); break; case NETDEV_REGISTER: + if (ops) + pr_warn("reg %px for %s, again, hook ifname %s (%d) cn %d\n", ops, dev= ->name, hook->ifname, hook->ifnamelen, changename); + /* NOP if not matching or already registered */ - if (!match || (changename && ops)) + if (!match || ops) continue; =20 ops =3D kzalloc_obj(struct nf_hook_ops, @@ -9701,7 +9704,6 @@ static int nft_flowtable_event(unsigned long event, s= truct net_device *dev, list_add_tail_rcu(&ops->list, &hook->ops_list); break; } - break; } return 0; }