From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from r3-19.sinamail.sina.com.cn (r3-19.sinamail.sina.com.cn [202.108.3.19]) (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 0D5C91CF7D5 for ; Sat, 21 Feb 2026 21:57:35 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=202.108.3.19 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1771711060; cv=none; b=JGByzbYICs42WHGsU4EHVKOfD8QBxVV4obbWb0nN3HvGjBBrEdbfqOcTCfckEggDrVgOYHEMkF01u5N/Vwf0PCAYLZ887R/dXsYP6lNsm59jcZo1Fj4hd4zZ7PaCMSnvuGLRdhGMfE/kot81QMSd5BsJUS4LHOeQ2wtjVVMpY4E= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1771711060; c=relaxed/simple; bh=e8/OldOLwjzYEd4XEgAAdT8WscAq359gWq8G9cS0fXc=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=Qopu+CG5jwTNJbaJHvwoHR7Je0tn39KInvjZ1vXHYpoKb3E3kqTPQbMrpkdMQ77kXIdbxYMZJcroCMgPGjEqhffYSr/qBPPt+SL9EoHLD91W5gcSeR2JlcpOBEnY2bClT4OvrO/+2/cQ3oTAMNypOHbq01f0Aa/+tN0j/Q20GtU= 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=OrFqik2r; arc=none smtp.client-ip=202.108.3.19 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="OrFqik2r" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=sina.com; s=201208; t=1771711056; bh=akkn67P/K2b6xmdSFmwXqXCJ6C4YDoAKWRtha/3/T5I=; h=From:Subject:Date:Message-ID; b=OrFqik2rYzzaTfYwMgAeTUkSiv5amxOkDbMY5h3gnT4ZI/oZIBVx92tE0ltV5aK3X 82YBiZFdUKYhAqUq116NrggUN0Js3oRAViGhfdNdHg4GdNBNmE/M1EkjSybKL6UEvx gkvTSIcQHR6SzyycgALwwMQv0iX4K0LGJrZrLr/U= X-SMAIL-HELO: localhost.localdomain Received: from unknown (HELO localhost.localdomain)([114.249.62.144]) by sina.com (10.54.253.32) with ESMTP id 699A2A45000041F5; Sat, 22 Feb 2026 05:57:27 +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: 1728184456615 X-SMAIL-UIID: FD28EE055CFC4E7AA60FB683AAFEA80D-20260222-055727-1 From: Hillf Danton To: syzbot Cc: linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com Subject: Re: [syzbot] [media?] KASAN: slab-use-after-free Read in dvb_frontend_release (3) Date: Sun, 22 Feb 2026 05:57:16 +0800 Message-ID: <20260221215717.3315-1-hdanton@sina.com> In-Reply-To: <6992e4aa.a70a0220.2c38d7.00e9.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: Mon, 16 Feb 2026 01:34:34 -0800 [thread overview] > syzbot has found a reproducer for the following issue on: > > HEAD commit: c22e26bd0906 Merge tag 'landlock-7.0-rc1' of git://git.ker.. > git tree: upstream > console output: https://syzkaller.appspot.com/x/log.txt?x=16bcf6e6580000 > kernel config: https://syzkaller.appspot.com/x/.config?x=6428d17febdfb14e > dashboard link: https://syzkaller.appspot.com/bug?extid=ae466a728017ec940b41 > 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=15ce3652580000 > C reproducer: https://syzkaller.appspot.com/x/repro.c?x=1121515a580000 #syz test --- x/drivers/media/dvb-core/dvb_frontend.c +++ y/drivers/media/dvb-core/dvb_frontend.c @@ -2836,6 +2836,7 @@ static int dvb_frontend_open(struct inod if ((ret = dvb_generic_open(inode, file)) < 0) goto err1; + dvb_device_get(dvbdev); if ((file->f_flags & O_ACCMODE) != O_RDONLY) { /* normal tune mode when opened R/W */ --