From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-oi1-f197.google.com (mail-oi1-f197.google.com [209.85.167.197]) (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 C69434DEC05 for ; Thu, 17 Sep 2026 16:48:44 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.167.197 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1789663726; cv=none; b=Dyqloqc829y2wHB7xS4qnxZZbE63gSQEfaX1oxKqc17IdjvBpbZqUH98Y1ZVYRP7bnlek5cBAjEveSLAHAWESEV3vHGQL10wwIgOLLTbW292LHFcVhkDSKgqAHkt7yBu9vkJlnUNVvGa9ZkRfXx2ihcpDip6R/jZfs5BTbKu49U= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1789663726; c=relaxed/simple; bh=dnNSjv6xLEel0IBLPtV4HS3EBau0mn9uPwhapcfw/Zo=; h=MIME-Version:Date:In-Reply-To:Message-ID:Subject:From:To: Content-Type; b=FO/3Sr3L691GNu4Yde94bsZkTYLDAvHunDWcMaBXcK1AIVasA3E2uAAWaOSCd7hf3cvCSVFEdx8YF33VbSkQolwt4TZbV6i1UwZ5Y+ssqxSEjuEeJRKD/K7h9GxPT2KtmSffB76mVAPMtAIqfTeRTKdFYodzbC2Kqoj1EjRtj5U= 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=209.85.167.197 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-oi1-f197.google.com with SMTP id 5614622812f47-4b2f2b8d88fso1555214b6e.2 for ; Thu, 17 Sep 2026 09:48:44 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20260707; t=1789663723; x=1790268523; h=content-type:to:from:subject:message-id:in-reply-to:date :mime-version:x-gm-message-state:from:to:cc:subject:date:message-id :reply-to:content-type; bh=nFZh9Cy3YRkgXARijTiARDYrMQR43FdwLIY1MsdhbWA=; b=cXU0Ju5lbG/EU40JqqHp33qwiE+8V+TssoJSSIlV7ksYC3/vXhUX4jh/uUaux9aPkq zr3Kuf3WO7G4oomr0+bsAXzgQcD2uFtWSwaLxyPDkiyu0owPxvJeyQK6yBLnRWGn5wWt p46fUN8SafT913CT1arirRzTbNKIUduaPyEYqg/5RrTKCJ+6vS08LBN4oW0NKEkrKfF/ aHBdPTH2Uf5TnWDOb1Fget562vsEylGvsUCP6j48ZTPbHzKYXBQG0Glqa6XkF0DPYrQ5 qcuQFyIsffKSe03yA/GkYr5KBaA0UtPr7akb7iuXRKPJJxJlsxbPsCmwFP/dH+bCOzxf JMuA== X-Gm-Message-State: AFuF++lvVxUtfyR4hT/DdOd65czYR3lTbagVRY4hueRexT7AhtoeYJ3C ZSpQa05xDJ9MYXoCrvhmOg8K2nhlqqJyZ2EsYAZGB+1uE8bdjrSAR92MJnX+rx3uc9W7n8GhGJy We0PLKVR6OVzJhDjIuoqtZu34vv+d6buTYRzSc/CLij7fpHhdUWMGCzUdHJg= Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6808:1242:b0:4c5:a75f:c5e1 with SMTP id 5614622812f47-4ca4bf7b68fmr9501807b6e.13.1789663723766; Thu, 17 Sep 2026 09:48:43 -0700 (PDT) Date: Thu, 17 Sep 2026 09:48:43 -0700 In-Reply-To: <6a8278d8.dbb3a75c.20434b.0041.GAE@google.com> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6aac19eb.87c06881.1db2b3.0017.GAE@google.com> Subject: Forwarded: Re: [syzbot] [kernel?] KASAN: slab-use-after-free Read in disable_device From: syzbot To: linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com 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: Re: [syzbot] [kernel?] KASAN: slab-use-after-free Read in disable_device Author: adarshdas950@gmail.com #syz test: git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master diff --git a/lib/kobject_uevent.c b/lib/kobject_uevent.c index ddbc4d7482d2..ecba33abb6b1 100644 --- a/lib/kobject_uevent.c +++ b/lib/kobject_uevent.c @@ -411,9 +411,15 @@ static int kobject_uevent_net_broadcast(struct kobject *kobj, devpath); else { const struct net *net = container_of(ns, struct net, ns); + struct uevent_sock *ue_sk; - ret = uevent_net_broadcast_tagged(net->uevent_sock->sk, env, - action_string, devpath); + mutex_lock(&uevent_sock_mutex); + ue_sk = net->uevent_sock; + if (ue_sk && ue_sk->sk) + ret = uevent_net_broadcast_tagged(ue_sk->sk, env, + action_string, + devpath); + mutex_unlock(&uevent_sock_mutex); } #endif @@ -804,13 +810,17 @@ static int uevent_net_init(struct net *net) static void uevent_net_exit(struct net *net) { - struct uevent_sock *ue_sk = net->uevent_sock; + struct uevent_sock *ue_sk; - if (sock_net(ue_sk->sk)->user_ns == &init_user_ns) { - mutex_lock(&uevent_sock_mutex); + mutex_lock(&uevent_sock_mutex); + ue_sk = net->uevent_sock; + net->uevent_sock = NULL; + if (ue_sk && sock_net(ue_sk->sk)->user_ns == &init_user_ns) list_del(&ue_sk->list); - mutex_unlock(&uevent_sock_mutex); - } + mutex_unlock(&uevent_sock_mutex); + + if (!ue_sk) + return; netlink_kernel_release(ue_sk->sk); kfree(ue_sk);