From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-0.7 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 04C43C43613 for ; Mon, 24 Jun 2019 08:39:09 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id CEC6C208CA for ; Mon, 24 Jun 2019 08:39:08 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727371AbfFXIjH (ORCPT ); Mon, 24 Jun 2019 04:39:07 -0400 Received: from mga09.intel.com ([134.134.136.24]:42278 "EHLO mga09.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726891AbfFXIjG (ORCPT ); Mon, 24 Jun 2019 04:39:06 -0400 X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from orsmga007.jf.intel.com ([10.7.209.58]) by orsmga102.jf.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 24 Jun 2019 01:39:06 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.63,411,1557212400"; d="scan'208";a="151887908" Received: from um.fi.intel.com (HELO localhost) ([10.237.72.63]) by orsmga007.jf.intel.com with ESMTP; 24 Jun 2019 01:39:01 -0700 From: Alexander Shishkin To: syzbot , acme@kernel.org, ast@kernel.org, bpf@vger.kernel.org, daniel@iogearbox.net, jolsa@redhat.com, kafai@fb.com, linux-kernel@vger.kernel.org, mingo@redhat.com, namhyung@kernel.org, netdev@vger.kernel.org, peterz@infradead.org, songliubraving@fb.com, syzkaller-bugs@googlegroups.com, yhs@fb.com, mark.rutland@arm.com, alexander.shishkin@linux.intel.com Subject: Re: KASAN: use-after-free Read in _free_event In-Reply-To: <000000000000dea828058c0d815d@google.com> References: <000000000000dea828058c0d815d@google.com> Date: Mon, 24 Jun 2019 11:39:00 +0300 Message-ID: <87pnn3v0m3.fsf@ashishki-desk.ger.corp.intel.com> MIME-Version: 1.0 Content-Type: text/plain Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org syzbot writes: > Unfortunately, I don't have any reproducer for this crash yet. > > IMPORTANT: if you fix the bug, please add the following tag to the commit: > Reported-by: syzbot+37100ea87beb0cac28f4@syzkaller.appspotmail.com > > ================================================================== > BUG: KASAN: use-after-free in atomic_read > include/asm-generic/atomic-instrumented.h:26 [inline] > BUG: KASAN: use-after-free in refcount_sub_and_test_checked+0x87/0x200 > lib/refcount.c:182 > Read of size 4 at addr ffff88804e9f06e0 by task syz-executor.5/13046 Looks exactly like [1]. There's a proposed fix there, too. [1] https://marc.info/?l=linux-kernel&m=153111554522295 Regards, -- Alex