From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp153-162.sina.com.cn (smtp153-162.sina.com.cn [61.135.153.162]) (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 CF0C82744F for ; Mon, 16 Feb 2026 05:16:24 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=61.135.153.162 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1771218991; cv=none; b=rC/ceiImpu5eNas8Eo7r+V5ijOOqNd5AvIW2tmHLTDFwIJx3zMLwEX5ZypeDdsYTnzNMtDK6xsuGRD1IWnBkfpAMA7w1q4/PVKamMkw22SM2H26w8KfC42DltWA5XxCGXSEMIxLX9HzRR3t9wm+Vkt0T4qGiiZkjEYJ2ATXNI34= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1771218991; c=relaxed/simple; bh=Q8YMN/wKG28ZMV9x1iDKEJxzDK9g/rXp/v+jPskwabw=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=CejedJ6e2TuW3AAmkoF2c7CmvXPgBkK0Wj7HWdZ4kNVHgojI+QLMJiBtnrVLIVtw83/rrGd/+/dUPssCEcqf3sqNgdJnZdiGjmlc50HO/wetIrz3Q2SJ+YltGPQ1wNNYN4iZCZbkqMfhRdLKPFI7NEdAS22A/sPM9H2A6TT4ydU= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=sina.com; spf=pass smtp.mailfrom=sina.com; dkim=pass (1024-bit key) header.d=sina.com header.i=@sina.com header.b=zNcklM0g; arc=none smtp.client-ip=61.135.153.162 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=sina.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=sina.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=sina.com header.i=@sina.com header.b="zNcklM0g" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=sina.com; s=201208; t=1771218985; bh=9bLYKEkGIO+pxPEntYKLKdXq1Sya1GiWUyV1TRRa1cM=; h=From:Subject:Date:Message-ID; b=zNcklM0gbE8HV1BMN3IyPC33+IU//Da2DrwJlwRKia4Is2Y4+/A3aMi7dzVlsWtb6 8HH7GR31hBGYHmOOfA8WB+LBScPplsfeny4XGhYIAKqrKuBIMCxjJiCi1oudZ70bAe Q8I85EN9O5wWZsJYK9wO/eFIMGik6n7qpdMbnbCI= X-SMAIL-HELO: localhost.localdomain Received: from unknown (HELO localhost.localdomain)([114.249.62.144]) by sina.com (10.54.253.31) with ESMTP id 6992A81C00007183; Mon, 16 Feb 2026 13:16:15 +0800 (CST) X-Sender: hdanton@sina.com X-Auth-ID: hdanton@sina.com Authentication-Results: sina.com; spf=none smtp.mailfrom=hdanton@sina.com; dkim=none header.i=none; dmarc=none action=none header.from=hdanton@sina.com X-SMAIL-MID: 6444376816570 X-SMAIL-UIID: 5F215282BF454692A01AC80B1FFA2AF7-20260216-131615-1 From: Hillf Danton To: syzbot Cc: linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com Subject: Re: [syzbot] [bpf?] [net?] KASAN: slab-use-after-free Read in sk_msg_recvmsg Date: Mon, 16 Feb 2026 13:16:00 +0800 Message-ID: <20260216051603.3161-1-hdanton@sina.com> In-Reply-To: <69922ac9.a70a0220.2c38d7.00e0.GAE@google.com> References: Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit > Date: Sun, 15 Feb 2026 12:21:29 -0800 [thread overview] > Hello, > > syzbot found the following issue on: > > HEAD commit: a040afa3bca4 gve: fix probe failure if clock read fails > git tree: net > console output: https://syzkaller.appspot.com/x/log.txt?x=165bf05a580000 > kernel config: https://syzkaller.appspot.com/x/.config?x=e3161cabe5a361ff > dashboard link: https://syzkaller.appspot.com/bug?extid=9307c991a6d07ce6e6d8 > compiler: Debian clang version 21.1.8 (++20251221033036+2078da43e25a-1~exp1~20251221153213.50), Debian LLD 21.1.8 > syz repro: https://syzkaller.appspot.com/x/repro.syz?x=13dd245a580000 > C reproducer: https://syzkaller.appspot.com/x/repro.c?x=16ecdb2a580000 #syz test --- x/net/core/skmsg.c +++ y/net/core/skmsg.c @@ -500,7 +500,13 @@ out: int sk_msg_recvmsg(struct sock *sk, struct sk_psock *psock, struct msghdr *msg, int len, int flags) { - return __sk_msg_recvmsg(sk, psock, msg, len, flags, NULL); + static DEFINE_MUTEX(lk); + int rc; + + mutex_lock(&lk); + rc = __sk_msg_recvmsg(sk, psock, msg, len, flags, NULL); + mutex_unlock(&lk); + return rc; } EXPORT_SYMBOL_GPL(sk_msg_recvmsg); --