From patchwork Mon Aug 24 08:31:14 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Greg KH X-Patchwork-Id: 265086 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=-10.7 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED, DKIM_VALID, HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT 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 6500FC433DF for ; Mon, 24 Aug 2020 09:23:25 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 3EF862074D for ; Mon, 24 Aug 2020 09:23:25 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1598261005; bh=PvGubglU6cmFIj4jp9q0XiJbLPU4XYVuiuvBCjSn7m8=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=TunkE5cF22emNfaPi35TN9PDAkCGGHBjgLxrPW+wcheTRdWGBH7lZVIfzrJhbf+59 7cFxVnQNKKaQvtbfShW5aKm61OJsmlWhw3s3NSFt8BHZyKeenAkEhwicLh/jDGkR2t y/khv/XbUszw36AxXz9dEtwPnKBFyAN/PxRtaVVY= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728930AbgHXJXV (ORCPT ); Mon, 24 Aug 2020 05:23:21 -0400 Received: from mail.kernel.org ([198.145.29.99]:34826 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729645AbgHXIyX (ORCPT ); Mon, 24 Aug 2020 04:54:23 -0400 Received: from localhost (83-86-89-107.cable.dynamic.v4.ziggo.nl [83.86.89.107]) (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 80E42207D3; Mon, 24 Aug 2020 08:54:22 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1598259263; bh=PvGubglU6cmFIj4jp9q0XiJbLPU4XYVuiuvBCjSn7m8=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=ioAqUkNmzXlnJ3Zv70ObhIMBQoOdk4W1RpzmN/Tfh+8aLci1htE6lX3BguqmoIvrS 81dg3iSJeJPfmvEFG3ZnCffOFyBIMRD/vq86mK56T0zIE7UxUa6AF9wV/q2oBLT5by Q3tiudjMzJg+8sEARBIk0inX4jUdGYiYSK+Vwzs8= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Hulk Robot , Wei Yongjun , Andrew Morton , Chris Wilson , Al Viro , Michael Ellerman , David Rientjes , Michel Lespinasse , Daniel Axtens , Thomas Gleixner , Akash Goel , Linus Torvalds Subject: [PATCH 4.14 13/50] kernel/relay.c: fix memleak on destroy relay channel Date: Mon, 24 Aug 2020 10:31:14 +0200 Message-Id: <20200824082352.641695215@linuxfoundation.org> X-Mailer: git-send-email 2.28.0 In-Reply-To: <20200824082351.823243923@linuxfoundation.org> References: <20200824082351.823243923@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Sender: stable-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Wei Yongjun commit 71e843295c680898959b22dc877ae3839cc22470 upstream. kmemleak report memory leak as follows: unreferenced object 0x607ee4e5f948 (size 8): comm "syz-executor.1", pid 2098, jiffies 4295031601 (age 288.468s) hex dump (first 8 bytes): 00 00 00 00 00 00 00 00 ........ backtrace: relay_open kernel/relay.c:583 [inline] relay_open+0xb6/0x970 kernel/relay.c:563 do_blk_trace_setup+0x4a8/0xb20 kernel/trace/blktrace.c:557 __blk_trace_setup+0xb6/0x150 kernel/trace/blktrace.c:597 blk_trace_ioctl+0x146/0x280 kernel/trace/blktrace.c:738 blkdev_ioctl+0xb2/0x6a0 block/ioctl.c:613 block_ioctl+0xe5/0x120 fs/block_dev.c:1871 vfs_ioctl fs/ioctl.c:48 [inline] __do_sys_ioctl fs/ioctl.c:753 [inline] __se_sys_ioctl fs/ioctl.c:739 [inline] __x64_sys_ioctl+0x170/0x1ce fs/ioctl.c:739 do_syscall_64+0x33/0x40 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 'chan->buf' is malloced in relay_open() by alloc_percpu() but not free while destroy the relay channel. Fix it by adding free_percpu() before return from relay_destroy_channel(). Fixes: 017c59c042d0 ("relay: Use per CPU constructs for the relay channel buffer pointers") Reported-by: Hulk Robot Signed-off-by: Wei Yongjun Signed-off-by: Andrew Morton Reviewed-by: Chris Wilson Cc: Al Viro Cc: Michael Ellerman Cc: David Rientjes Cc: Michel Lespinasse Cc: Daniel Axtens Cc: Thomas Gleixner Cc: Akash Goel Cc: Link: http://lkml.kernel.org/r/20200817122826.48518-1-weiyongjun1@huawei.com Signed-off-by: Linus Torvalds Signed-off-by: Greg Kroah-Hartman --- kernel/relay.c | 1 + 1 file changed, 1 insertion(+) --- a/kernel/relay.c +++ b/kernel/relay.c @@ -196,6 +196,7 @@ free_buf: static void relay_destroy_channel(struct kref *kref) { struct rchan *chan = container_of(kref, struct rchan, kref); + free_percpu(chan->buf); kfree(chan); }