From patchwork Wed May 27 08:23:34 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Tomi Valkeinen X-Patchwork-Id: 64065 X-Patchwork-Delegate: hverkuil@xs4all.nl Received: from vger.kernel.org ([23.128.96.18]) by www.linuxtv.org with esmtp (Exim 4.92) (envelope-from ) id 1jdrII-006sKE-KC; Wed, 27 May 2020 08:20:15 +0000 Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2387722AbgE0IXu (ORCPT + 1 other); Wed, 27 May 2020 04:23:50 -0400 Received: from fllv0015.ext.ti.com ([198.47.19.141]:56940 "EHLO fllv0015.ext.ti.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729448AbgE0IXt (ORCPT ); Wed, 27 May 2020 04:23:49 -0400 Received: from lelv0266.itg.ti.com ([10.180.67.225]) by fllv0015.ext.ti.com (8.15.2/8.15.2) with ESMTP id 04R8NhfD055005; Wed, 27 May 2020 03:23:43 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ti.com; s=ti-com-17Q1; t=1590567823; bh=GyTLg1Md2fYLJ6g5xaEEx7UWj2p3nMkQ9a8MM4uR48U=; h=From:To:CC:Subject:Date; b=sE29BLQ+N9saDCTgZSfSg3ULjDAe4yAjvivJa6mD/EPicuCXm43YPGY0j/i002rhA 4UVpw9YOZZPeT1Lxo+x0s+KvOeh5kDHB/qQ1dO6S5FIc/DA26B1OkTYC66aQcHBf52 o+4S25WdmoGvBM+qhZLLVi1WocFzeEudHyTLzxKI= Received: from DLEE102.ent.ti.com (dlee102.ent.ti.com [157.170.170.32]) by lelv0266.itg.ti.com (8.15.2/8.15.2) with ESMTPS id 04R8Nhfv098062 (version=TLSv1.2 cipher=AES256-GCM-SHA384 bits=256 verify=FAIL); Wed, 27 May 2020 03:23:43 -0500 Received: from DLEE105.ent.ti.com (157.170.170.35) by DLEE102.ent.ti.com (157.170.170.32) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256_P256) id 15.1.1979.3; Wed, 27 May 2020 03:23:43 -0500 Received: from lelv0326.itg.ti.com (10.180.67.84) by DLEE105.ent.ti.com (157.170.170.35) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256_P256) id 15.1.1979.3 via Frontend Transport; Wed, 27 May 2020 03:23:43 -0500 Received: from deskari.ti.com (ileax41-snat.itg.ti.com [10.172.224.153]) by lelv0326.itg.ti.com (8.15.2/8.15.2) with ESMTP id 04R8NfcE106256; Wed, 27 May 2020 03:23:41 -0500 From: Tomi Valkeinen To: Linux Media Mailing List , Mauro Carvalho Chehab , Marek Szyprowski , Ulf Hansson CC: LKML , Tomi Valkeinen , Subject: [PATCHv2] media: videobuf2-dma-contig: fix bad kfree in vb2_dma_contig_clear_max_seg_size Date: Wed, 27 May 2020 11:23:34 +0300 Message-ID: <20200527082334.20774-1-tomi.valkeinen@ti.com> X-Mailer: git-send-email 2.17.1 MIME-Version: 1.0 X-EXCLAIMER-MD-CONFIG: e1e8a2fd-e40a-4ac6-ac9b-f7e9cc9ee180 Sender: linux-media-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-media@vger.kernel.org X-LSpam-Score: -2.5 (--) X-LSpam-Report: No, score=-2.5 required=5.0 tests=BAYES_00=-1.9,DKIMWL_WL_HIGH=0.001,DKIM_SIGNED=0.1,DKIM_VALID=-0.1,DKIM_VALID_AU=-0.1,HEADER_FROM_DIFFERENT_DOMAINS=0.5,MAILING_LIST_MULTI=-1 autolearn=ham autolearn_force=no Commit 9495b7e92f716ab2bd6814fab5e97ab4a39adfdd ("driver core: platform: Initialize dma_parms for platform devices") in v5.7-rc5 causes vb2_dma_contig_clear_max_seg_size() to kfree memory that was not allocated by vb2_dma_contig_set_max_seg_size(). The assumption in vb2_dma_contig_set_max_seg_size() seems to be that dev->dma_parms is always NULL when the driver is probed, and the case where dev->dma_parms has bee initialized by someone else than the driver (by calling vb2_dma_contig_set_max_seg_size) will cause a failure. All the current users of these functions are platform devices, which now always have dma_parms set by the driver core. To fix the issue for v5.7, make vb2_dma_contig_set_max_seg_size() return an error if dma_parms is NULL to be on the safe side, and remove the kfree code from vb2_dma_contig_clear_max_seg_size(). For v5.8 we should remove the two functions and move the dma_set_max_seg_size() calls into the drivers. Signed-off-by: Tomi Valkeinen Fixes: 9495b7e92f71 ("driver core: platform: Initialize dma_parms for platform devices") Cc: stable@vger.kernel.org Acked-by: Marek Szyprowski Reviewed-by: Ulf Hansson --- Changes in v2: * vb2_dma_contig_clear_max_seg_size to empty static inline * Added cc: stable and fixes tag .../common/videobuf2/videobuf2-dma-contig.c | 20 ++----------------- include/media/videobuf2-dma-contig.h | 2 +- 2 files changed, 3 insertions(+), 19 deletions(-) diff --git a/drivers/media/common/videobuf2/videobuf2-dma-contig.c b/drivers/media/common/videobuf2/videobuf2-dma-contig.c index d3a3ee5b597b..f4b4a7c135eb 100644 --- a/drivers/media/common/videobuf2/videobuf2-dma-contig.c +++ b/drivers/media/common/videobuf2/videobuf2-dma-contig.c @@ -726,9 +726,8 @@ EXPORT_SYMBOL_GPL(vb2_dma_contig_memops); int vb2_dma_contig_set_max_seg_size(struct device *dev, unsigned int size) { if (!dev->dma_parms) { - dev->dma_parms = kzalloc(sizeof(*dev->dma_parms), GFP_KERNEL); - if (!dev->dma_parms) - return -ENOMEM; + dev_err(dev, "Failed to set max_seg_size: dma_parms is NULL\n"); + return -ENODEV; } if (dma_get_max_seg_size(dev) < size) return dma_set_max_seg_size(dev, size); @@ -737,21 +736,6 @@ int vb2_dma_contig_set_max_seg_size(struct device *dev, unsigned int size) } EXPORT_SYMBOL_GPL(vb2_dma_contig_set_max_seg_size); -/* - * vb2_dma_contig_clear_max_seg_size() - release resources for DMA parameters - * @dev: device for configuring DMA parameters - * - * This function releases resources allocated to configure DMA parameters - * (see vb2_dma_contig_set_max_seg_size() function). It should be called from - * device drivers on driver remove. - */ -void vb2_dma_contig_clear_max_seg_size(struct device *dev) -{ - kfree(dev->dma_parms); - dev->dma_parms = NULL; -} -EXPORT_SYMBOL_GPL(vb2_dma_contig_clear_max_seg_size); - MODULE_DESCRIPTION("DMA-contig memory handling routines for videobuf2"); MODULE_AUTHOR("Pawel Osciak "); MODULE_LICENSE("GPL"); diff --git a/include/media/videobuf2-dma-contig.h b/include/media/videobuf2-dma-contig.h index 5604818d137e..5be313cbf7d7 100644 --- a/include/media/videobuf2-dma-contig.h +++ b/include/media/videobuf2-dma-contig.h @@ -25,7 +25,7 @@ vb2_dma_contig_plane_dma_addr(struct vb2_buffer *vb, unsigned int plane_no) } int vb2_dma_contig_set_max_seg_size(struct device *dev, unsigned int size); -void vb2_dma_contig_clear_max_seg_size(struct device *dev); +static inline void vb2_dma_contig_clear_max_seg_size(struct device *dev) { } extern const struct vb2_mem_ops vb2_dma_contig_memops;