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=-9.8 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=unavailable 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 BDE39C33CA3 for ; Sat, 11 Jan 2020 10:04:52 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 94B9420848 for ; Sat, 11 Jan 2020 10:04:52 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1578737092; bh=YQpnEO+zftTcEksKOgn/okVCs3guuDl7CCpC4AedMHE=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=fVIRuLOmX19Ng84EP1RQ0DNnZMdUTpzCR7F1LFwoWVE73xCppRkeWJE4s/5SYmWC6 PTyBrWWBwUGpz76cg7MuVdRsDlEh50c5l1hvHpfsDlZxefCGO74eQmEbZTUu45FArJ NrWacIGaRCTtQTNXBRaPzR9+/JPyjoo89aIqO3Qw= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729560AbgAKKEv (ORCPT ); Sat, 11 Jan 2020 05:04:51 -0500 Received: from mail.kernel.org ([198.145.29.99]:37562 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729014AbgAKKEu (ORCPT ); Sat, 11 Jan 2020 05:04:50 -0500 Received: from localhost (unknown [62.119.166.9]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id A5B0B2082E; Sat, 11 Jan 2020 10:04:48 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1578737089; bh=YQpnEO+zftTcEksKOgn/okVCs3guuDl7CCpC4AedMHE=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=XB2gIP6m5r+VB35xoxUPaiEk5pKdiR2a+ry4yx0Hz3ZQ2P620s45xSpxDZyL9e6cl VQP1dssD8xB8TFcgECfhkGEKF9CX8wVM2j5YsmLb6qV8FzScwkxTJn1sr78o1BIhZy GMiI7eldFm1ipq+ujpMlZWploTN168YeJaVrSmDk= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Bob Liu , Hulk Robot , Yang Yingliang , Jens Axboe , Sasha Levin Subject: [PATCH 4.9 77/91] block: fix memleak when __blk_rq_map_user_iov() is failed Date: Sat, 11 Jan 2020 10:50:10 +0100 Message-Id: <20200111094911.864379186@linuxfoundation.org> X-Mailer: git-send-email 2.24.1 In-Reply-To: <20200111094844.748507863@linuxfoundation.org> References: <20200111094844.748507863@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Yang Yingliang [ Upstream commit 3b7995a98ad76da5597b488fa84aa5a56d43b608 ] When I doing fuzzy test, get the memleak report: BUG: memory leak unreferenced object 0xffff88837af80000 (size 4096): comm "memleak", pid 3557, jiffies 4294817681 (age 112.499s) hex dump (first 32 bytes): 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ 20 00 00 00 10 01 00 00 00 00 00 00 01 00 00 00 ............... backtrace: [<000000001c894df8>] bio_alloc_bioset+0x393/0x590 [<000000008b139a3c>] bio_copy_user_iov+0x300/0xcd0 [<00000000a998bd8c>] blk_rq_map_user_iov+0x2f1/0x5f0 [<000000005ceb7f05>] blk_rq_map_user+0xf2/0x160 [<000000006454da92>] sg_common_write.isra.21+0x1094/0x1870 [<00000000064bb208>] sg_write.part.25+0x5d9/0x950 [<000000004fc670f6>] sg_write+0x5f/0x8c [<00000000b0d05c7b>] __vfs_write+0x7c/0x100 [<000000008e177714>] vfs_write+0x1c3/0x500 [<0000000087d23f34>] ksys_write+0xf9/0x200 [<000000002c8dbc9d>] do_syscall_64+0x9f/0x4f0 [<00000000678d8e9a>] entry_SYSCALL_64_after_hwframe+0x49/0xbe If __blk_rq_map_user_iov() is failed in blk_rq_map_user_iov(), the bio(s) which is allocated before this failing will leak. The refcount of the bio(s) is init to 1 and increased to 2 by calling bio_get(), but __blk_rq_unmap_user() only decrease it to 1, so the bio cannot be freed. Fix it by calling blk_rq_unmap_user(). Reviewed-by: Bob Liu Reported-by: Hulk Robot Signed-off-by: Yang Yingliang Signed-off-by: Jens Axboe Signed-off-by: Sasha Levin --- block/blk-map.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/block/blk-map.c b/block/blk-map.c index a8b4f526d8bb..52edbe6b9380 100644 --- a/block/blk-map.c +++ b/block/blk-map.c @@ -142,7 +142,7 @@ int blk_rq_map_user_iov(struct request_queue *q, struct request *rq, return 0; unmap_rq: - __blk_rq_unmap_user(bio); + blk_rq_unmap_user(bio); fail: rq->bio = NULL; return ret; -- 2.20.1