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=-6.8 required=3.0 tests=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=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 D622CC2D0DB for ; Thu, 30 Jan 2020 18:40:50 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id A9955205F4 for ; Thu, 30 Jan 2020 18:40:50 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1580409650; bh=moH1Dju2hdUQ4ndOGrn3StVqZIQretD0BJ/mudOpM9s=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=nrYgdZAIyToBK5Y2GVS63rbfMO5PaAHg7GQJZDZqe646QxSpGuPAhb7nDG6YBHc9K D39gVenpj3T+scZ6mvlcdn+sXJYs08xgoWyUhUg1RD+iicFC5JNqEdYO3ywPc5hiSn PI1V6flIazIqhHyjBF3g1UHBN6hKICabg1RyLxXk= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730039AbgA3Sku (ORCPT ); Thu, 30 Jan 2020 13:40:50 -0500 Received: from mail.kernel.org ([198.145.29.99]:48408 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1730020AbgA3Sko (ORCPT ); Thu, 30 Jan 2020 13:40:44 -0500 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 1A17B214DB; Thu, 30 Jan 2020 18:40:42 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1580409643; bh=moH1Dju2hdUQ4ndOGrn3StVqZIQretD0BJ/mudOpM9s=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=cFQitvYiA4gbMiKgKj+vUP9rCv+fVD257PvSk1GNS7U0JMSXbGtSsIdZ06cIFUFis XRW1nwoBmksOWIHqPc0BnJDqxwbJey1o9LttHScttYoAzTMz2YxIpQo48S20QT2DTS p+27tYAABxCjO/XNmFSR5ReR4p6swmO3v3SKWsyY= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, "Paulo Alcantara (SUSE)" , Steve French , Pavel Shilovsky Subject: [PATCH 5.5 31/56] cifs: Fix memory allocation in __smb2_handle_cancelled_cmd() Date: Thu, 30 Jan 2020 19:38:48 +0100 Message-Id: <20200130183614.727685599@linuxfoundation.org> X-Mailer: git-send-email 2.25.0 In-Reply-To: <20200130183608.849023566@linuxfoundation.org> References: <20200130183608.849023566@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: Paulo Alcantara (SUSE) commit 0a5a98863c9debc02387b3d23c46d187756f5e2b upstream. __smb2_handle_cancelled_cmd() is called under a spin lock held in cifs_mid_q_entry_release(), so make its memory allocation GFP_ATOMIC. This issue was observed when running xfstests generic/028: [ 1722.589204] CIFS VFS: \\192.168.30.26 Cancelling wait for mid 72064 cmd: 5 [ 1722.590687] CIFS VFS: \\192.168.30.26 Cancelling wait for mid 72065 cmd: 17 [ 1722.593529] CIFS VFS: \\192.168.30.26 Cancelling wait for mid 72066 cmd: 6 [ 1723.039014] BUG: sleeping function called from invalid context at mm/slab.h:565 [ 1723.040710] in_atomic(): 1, irqs_disabled(): 0, non_block: 0, pid: 30877, name: cifsd [ 1723.045098] CPU: 3 PID: 30877 Comm: cifsd Not tainted 5.5.0-rc4+ #313 [ 1723.046256] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS rel-1.12.0-59-gc9ba527-rebuilt.opensuse.org 04/01/2014 [ 1723.048221] Call Trace: [ 1723.048689] dump_stack+0x97/0xe0 [ 1723.049268] ___might_sleep.cold+0xd1/0xe1 [ 1723.050069] kmem_cache_alloc_trace+0x204/0x2b0 [ 1723.051051] __smb2_handle_cancelled_cmd+0x40/0x140 [cifs] [ 1723.052137] smb2_handle_cancelled_mid+0xf6/0x120 [cifs] [ 1723.053247] cifs_mid_q_entry_release+0x44d/0x630 [cifs] [ 1723.054351] ? cifs_reconnect+0x26a/0x1620 [cifs] [ 1723.055325] cifs_demultiplex_thread+0xad4/0x14a0 [cifs] [ 1723.056458] ? cifs_handle_standard+0x2c0/0x2c0 [cifs] [ 1723.057365] ? kvm_sched_clock_read+0x14/0x30 [ 1723.058197] ? sched_clock+0x5/0x10 [ 1723.058838] ? sched_clock_cpu+0x18/0x110 [ 1723.059629] ? lockdep_hardirqs_on+0x17d/0x250 [ 1723.060456] kthread+0x1ab/0x200 [ 1723.061149] ? cifs_handle_standard+0x2c0/0x2c0 [cifs] [ 1723.062078] ? kthread_create_on_node+0xd0/0xd0 [ 1723.062897] ret_from_fork+0x3a/0x50 Signed-off-by: Paulo Alcantara (SUSE) Fixes: 9150c3adbf24 ("CIFS: Close open handle after interrupted close") Cc: Stable Signed-off-by: Steve French Reviewed-by: Pavel Shilovsky Signed-off-by: Greg Kroah-Hartman --- fs/cifs/smb2misc.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/fs/cifs/smb2misc.c +++ b/fs/cifs/smb2misc.c @@ -743,7 +743,7 @@ __smb2_handle_cancelled_cmd(struct cifs_ { struct close_cancelled_open *cancelled; - cancelled = kzalloc(sizeof(*cancelled), GFP_KERNEL); + cancelled = kzalloc(sizeof(*cancelled), GFP_ATOMIC); if (!cancelled) return -ENOMEM;