From patchwork Thu Dec 1 03:00:50 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Koba Ko X-Patchwork-Id: 13060937 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 7BC2BC4321E for ; Thu, 1 Dec 2022 03:01:03 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229569AbiLADBC (ORCPT ); Wed, 30 Nov 2022 22:01:02 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:55204 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229640AbiLADBB (ORCPT ); Wed, 30 Nov 2022 22:01:01 -0500 Received: from smtp-relay-internal-1.canonical.com (smtp-relay-internal-1.canonical.com [185.125.188.123]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 478DE7B4F6 for ; Wed, 30 Nov 2022 19:01:00 -0800 (PST) Received: from mail-pj1-f71.google.com (mail-pj1-f71.google.com [209.85.216.71]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by smtp-relay-internal-1.canonical.com (Postfix) with ESMTPS id D2EE83F32E for ; Thu, 1 Dec 2022 03:00:57 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=canonical.com; s=20210705; t=1669863657; bh=KBEEiz1TwZZ9uiWteaos76O1CPVzORDpb4GxX5fxihg=; h=From:To:Subject:Date:Message-Id:MIME-Version; b=JD1uVAIfn53tavL45PndwHV1zKJLU3qD2mycucPdmBncrpdilSydNo+Ni4/eHB7CZ j736dSidk3SHxv6rD5RUVebsh/gMMlnznRemnMj3uWXQT50fOzy6Qr8dqzWzwXC24l fHz19Iwfm6qr+xpfxahN7TqQUheaJqTAad2v7J/lFCoYrTjKpOtaHW4xoY6ySPFiZX cdiLvliUX8DYCSAM2zDIOkpCQ3BkxAQDNOa3Ap1KiAbCHBcwz4i4EkPq4DPW2LI/T/ 7RqRyci2z4ZYIrbxWARW/+VxJwZv2aPfqdx8kgUOM2+mISVGDd7stlULktz0MHYd9S WJja/tmfOc3AA== Received: by mail-pj1-f71.google.com with SMTP id pi2-20020a17090b1e4200b0021834843687so4424157pjb.0 for ; Wed, 30 Nov 2022 19:00:57 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=content-transfer-encoding:mime-version:message-id:date:subject:to :from:x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=KBEEiz1TwZZ9uiWteaos76O1CPVzORDpb4GxX5fxihg=; b=rQ8bfU4g+Sdmn93z/E7Embr8oQNF1C13NOrxPxj4ZkV23dqr6X2KE8pcStrouoC35V Fvz/19fRWhdEUo8iYYgKswIxIKwWtwAlyRYgShxwXqX+0qsVtKRtY69sjQcK4glvC0bI qZpM7dqKRmQq7VIgoaIUB56CBchPQxyNCJ56MPK5GHPNyNuItKu5IyIlBwTVByb4spKB piIDF4I4OqAM4p69a+uGIc8v4rbYEP79rYagJUZcM4t1Z9VS7IRP0Q2VyrXmoWL3GTKJ eSqlwW0YhmhgG/5dv5SFzqsUJ75hxZBe4OEPNLu8/GtCE+3CTX7eqBHeuiwyTdXtFN0B JYqQ== X-Gm-Message-State: ANoB5pngx7e9w8zyyz+361DMphd/d5oi7KrHboRBECAxpbZJa/S9ezKX H7mztPRnp84ErrmqhOt2dHG7zIUnliwPfv5wepzX7pHxDEiq6n/S9Lsqv/nKAVKEiZUUy/HziJ7 zRkI20v/CK9JM/UkoML94+i89pOcXmwJaENS3Bg== X-Received: by 2002:a17:90b:3608:b0:219:6b1b:63d8 with SMTP id ml8-20020a17090b360800b002196b1b63d8mr4653610pjb.143.1669863653226; Wed, 30 Nov 2022 19:00:53 -0800 (PST) X-Google-Smtp-Source: AA0mqf5MbvCRZ/jl/yEErQVESS5W/MxdmKCHh4VnDUAEnypUj3sRGH1q8jjQVz/3/1Le8Lb8B4CjIQ== X-Received: by 2002:a17:90b:3608:b0:219:6b1b:63d8 with SMTP id ml8-20020a17090b360800b002196b1b63d8mr4653570pjb.143.1669863652813; Wed, 30 Nov 2022 19:00:52 -0800 (PST) Received: from canonical.com (2001-b011-300b-b863-5ce4-cae4-1ba7-6f5b.dynamic-ip6.hinet.net. [2001:b011:300b:b863:5ce4:cae4:1ba7:6f5b]) by smtp.gmail.com with ESMTPSA id q19-20020aa79613000000b00562a526cd2esm2078337pfg.55.2022.11.30.19.00.52 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 30 Nov 2022 19:00:52 -0800 (PST) From: Koba Ko To: Vinod Koul , dmaengine@vger.kernel.org, linux-kernel@vger.kernel.org, Jerry Snitselaar , Jie Hai , Dave Jiang , Joel Savitz Subject: [PATCH V3] dmaengine: Fix double increment of client_count in dma_chan_get() Date: Thu, 1 Dec 2022 11:00:50 +0800 Message-Id: <20221201030050.978595-1-koba.ko@canonical.com> X-Mailer: git-send-email 2.34.1 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: dmaengine@vger.kernel.org The first time dma_chan_get() is called for a channel the channel client_count is incorrectly incremented twice for public channels, first in balance_ref_count(), and again prior to returning. This results in an incorrect client count which will lead to the channel resources not being freed when they should be. A simple test of repeated module load and unload of async_tx on a Dell Power Edge R7425 also shows this resulting in a kref underflow warning. [ 124.329662] async_tx: api initialized (async) [ 129.000627] async_tx: api initialized (async) [ 130.047839] ------------[ cut here ]------------ [ 130.052472] refcount_t: underflow; use-after-free. [ 130.057279] WARNING: CPU: 3 PID: 19364 at lib/refcount.c:28 refcount_warn_saturate+0xba/0x110 [ 130.065811] Modules linked in: async_tx(-) rfkill intel_rapl_msr intel_rapl_common amd64_edac edac_mce_amd ipmi_ssif kvm_amd dcdbas kvm mgag200 drm_shmem_helper acpi_ipmi irqbypass drm_kms_helper ipmi_si syscopyarea sysfillrect rapl pcspkr ipmi_devintf sysimgblt fb_sys_fops k10temp i2c_piix4 ipmi_msghandler acpi_power_meter acpi_cpufreq vfat fat drm fuse xfs libcrc32c sd_mod t10_pi sg ahci crct10dif_pclmul libahci crc32_pclmul crc32c_intel ghash_clmulni_intel igb megaraid_sas i40e libata i2c_algo_bit ccp sp5100_tco dca dm_mirror dm_region_hash dm_log dm_mod [last unloaded: async_tx] [ 130.117361] CPU: 3 PID: 19364 Comm: modprobe Kdump: loaded Not tainted 5.14.0-185.el9.x86_64 #1 [ 130.126091] Hardware name: Dell Inc. PowerEdge R7425/02MJ3T, BIOS 1.18.0 01/17/2022 [ 130.133806] RIP: 0010:refcount_warn_saturate+0xba/0x110 [ 130.139041] Code: 01 01 e8 6d bd 55 00 0f 0b e9 72 9d 8a 00 80 3d 26 18 9c 01 00 75 85 48 c7 c7 f8 a3 03 9d c6 05 16 18 9c 01 01 e8 4a bd 55 00 <0f> 0b e9 4f 9d 8a 00 80 3d 01 18 9c 01 00 0f 85 5e ff ff ff 48 c7 [ 130.157807] RSP: 0018:ffffbf98898afe68 EFLAGS: 00010286 [ 130.163036] RAX: 0000000000000000 RBX: ffff9da06028e598 RCX: 0000000000000000 [ 130.170172] RDX: ffff9daf9de26480 RSI: ffff9daf9de198a0 RDI: ffff9daf9de198a0 [ 130.177316] RBP: ffff9da7cddf3970 R08: 0000000000000000 R09: 00000000ffff7fff [ 130.184459] R10: ffffbf98898afd00 R11: ffffffff9d9e8c28 R12: ffff9da7cddf1970 [ 130.191596] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 [ 130.198739] FS: 00007f646435c740(0000) GS:ffff9daf9de00000(0000) knlGS:0000000000000000 [ 130.206832] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 130.212586] CR2: 00007f6463b214f0 CR3: 00000008ab98c000 CR4: 00000000003506e0 [ 130.219729] Call Trace: [ 130.222192] [ 130.224305] dma_chan_put+0x10d/0x110 [ 130.227988] dmaengine_put+0x7a/0xa0 [ 130.231575] __do_sys_delete_module.constprop.0+0x178/0x280 [ 130.237157] ? syscall_trace_enter.constprop.0+0x145/0x1d0 [ 130.242652] do_syscall_64+0x5c/0x90 [ 130.246240] ? exc_page_fault+0x62/0x150 [ 130.250178] entry_SYSCALL_64_after_hwframe+0x63/0xcd [ 130.255243] RIP: 0033:0x7f6463a3f5ab [ 130.258830] Code: 73 01 c3 48 8b 0d 75 a8 1b 00 f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 90 f3 0f 1e fa b8 b0 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d 45 a8 1b 00 f7 d8 64 89 01 48 [ 130.277591] RSP: 002b:00007fff22f972c8 EFLAGS: 00000206 ORIG_RAX: 00000000000000b0 [ 130.285164] RAX: ffffffffffffffda RBX: 000055b6786edd40 RCX: 00007f6463a3f5ab [ 130.292303] RDX: 0000000000000000 RSI: 0000000000000800 RDI: 000055b6786edda8 [ 130.299443] RBP: 000055b6786edd40 R08: 0000000000000000 R09: 0000000000000000 [ 130.306584] R10: 00007f6463b9eac0 R11: 0000000000000206 R12: 000055b6786edda8 [ 130.313731] R13: 0000000000000000 R14: 000055b6786edda8 R15: 00007fff22f995f8 [ 130.320875] [ 130.323081] ---[ end trace eff7156d56b5cf25 ]--- cat /sys/class/dma/dma0chan*/in_use would get the wrong result. 2 2 2 Fixes: d2f4f99db3e9 ("dmaengine: Rework dma_chan_get") Signed-off-by: Koba Ko Reviewed-by: Jie Hai Test-by: Jie Hai Reviewed-by: Jerry Snitselaar Reviewed-by: Dave Jiang Tested-by: Joel Savitz --- V2: Remove [3/3] on subject. V3: Refine title and comments as per suggestions. Ref: https://patchwork.kernel.org/project/linux-dmaengine/patch/20220930173652.1251349-1-koba.ko@canonical.com/ --- drivers/dma/dmaengine.c | 7 ++++--- 1 file changed, 4 insertions(+), 3 deletions(-) diff --git a/drivers/dma/dmaengine.c b/drivers/dma/dmaengine.c index 2cfa8458b51be..78f8a9f3ad825 100644 --- a/drivers/dma/dmaengine.c +++ b/drivers/dma/dmaengine.c @@ -451,7 +451,8 @@ static int dma_chan_get(struct dma_chan *chan) /* The channel is already in use, update client count */ if (chan->client_count) { __module_get(owner); - goto out; + chan->client_count++; + return 0; } if (!try_module_get(owner)) @@ -470,11 +471,11 @@ static int dma_chan_get(struct dma_chan *chan) goto err_out; } + chan->client_count++; + if (!dma_has_cap(DMA_PRIVATE, chan->device->cap_mask)) balance_ref_count(chan); -out: - chan->client_count++; return 0; err_out: