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[2620:137:e000::1:20]) by mx.google.com with ESMTP id bo12-20020a056a000e8c00b006878350b928si1800203pfb.236.2023.08.04.08.08.49; Fri, 04 Aug 2023 08:09:10 -0700 (PDT) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20; Authentication-Results: mx.google.com; dkim=pass header.i=@kernel.org header.s=k20201202 header.b=T+aVO57g; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231846AbjHDOt2 (ORCPT + 99 others); Fri, 4 Aug 2023 10:49:28 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:35542 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231844AbjHDOt0 (ORCPT ); Fri, 4 Aug 2023 10:49:26 -0400 Received: from dfw.source.kernel.org (dfw.source.kernel.org [139.178.84.217]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id CBA6D49C7; Fri, 4 Aug 2023 07:49:23 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id 639F962054; Fri, 4 Aug 2023 14:49:23 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 37DFFC433C8; Fri, 4 Aug 2023 14:49:21 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1691160562; bh=QT3MsKCVhyq7VXab1vdD48amnZ+BMWNEaJcvg9qS81E=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=T+aVO57g/9aDf6XFf85v+Um2i+7ugfkgJSbQn9w+sRC97KE33UWkfv0FdfCdtuO2C TpgkLyjYMx+VGtpfTUJueN9x/+mSbUgFD7wGm6hCG01zxMx3hJyUysA4u5TW8TdMez 0nxYGtxYYCHp7iRq6QKiwx+qi0C6HD80XQvfC2YNr08YPvGYjghcF+eZPE4hcFsQQ5 aSFLwQNw1Y/HMB9Z4V529Dd8BQVplruGbP9/ZSOv1If3HB/JAMyCpPZzSv7FowCCit J37rstuQ7NfpC5Uw5ihFnlC1/w9YgPZsdjc4JPpcEbIrVGVVJCtuUW6lbX+ma0X/7i O1a5fc0qmInSg== Date: Fri, 4 Aug 2023 16:49:18 +0200 From: Christian Brauner To: Christoph Hellwig Cc: syzbot , jack@suse.cz, linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com, viro@zeniv.linux.org.uk Subject: Re: [syzbot] [fs?] KASAN: slab-use-after-free Read in test_bdev_super_fc Message-ID: <20230804-kurvigen-uninteressant-09d451db7458@brauner> References: <00000000000058d58e06020c1cab@google.com> <20230804101408.GA23274@lst.de> <20230804-abstieg-behilflich-eda2ce9c2c0f@brauner> <20230804140201.GA27600@lst.de> <20230804-allheilmittel-teleobjektiv-a0351a653d31@brauner> <20230804144343.GA28230@lst.de> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: <20230804144343.GA28230@lst.de> X-Spam-Status: No, score=-2.1 required=5.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF, RCVD_IN_DNSWL_BLOCKED,SPF_HELO_NONE,SPF_PASS autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Fri, Aug 04, 2023 at 04:43:43PM +0200, Christoph Hellwig wrote: > On Fri, Aug 04, 2023 at 04:36:49PM +0200, Christian Brauner wrote: > > FFS > > Good spot, this explains the missing dropping of s_umount. > > But I don't think it's doing the right thing for MTD mount romfs, > we'll need something like this: I'll fold a fix into Jan's patch.