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Mon, 4 May 2020 12:54:22 +0000 (GMT) From: Marek Szyprowski To: dri-devel@lists.freedesktop.org, iommu@lists.linux-foundation.org, linaro-mm-sig@lists.linaro.org, linux-kernel@vger.kernel.org Subject: [PATCH v2 19/21] dmabuf: fix sg_table nents vs. orig_nents misuse Date: Mon, 4 May 2020 14:53:57 +0200 Message-Id: <20200504125359.5678-19-m.szyprowski@samsung.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20200504125359.5678-1-m.szyprowski@samsung.com> X-Brightmail-Tracker: H4sIAAAAAAAAA0VSeUgUURzm7Rw7mmvjavo8StjohDywPyYsSTIYwkIIyYSsTcdVctV2PFIK Fy2pzU1bwysr3QTvM9nEtPLIzQwrNbF0PVNREI1dlUy0Hafsv+/3He9778cjEHEd5kRERscx imhplAS3RHVdvz4dUZJ1IR5TkxaUurdbQNXn1WLUpu4hQg0sL+JUeeU7AVX0xpsyDUwIqIap QYzqby7EqepOg5BqW/qBUR8MRuFJK7rqaRWgW1eKUHpksAWnX66MY/TYfb2AflGSQg9vTCF0 9lApoF99U+L0g8YKQBsb9gTsCLY8HsZERSYwCnefK5YR+o4NPLbf7oZu/IlQCcpsVIAgIHkU akuCVcCCEJNlAE7cC1cBSzM2AdinbcH4wQhgTv4zAefiAgVjmUJeKAVw9bsJ3Y4Y1KsI58JJ T6haUOEctiPvAPhebcWZELJdAAvLZ1FOsCXPwN+auS0TSu6DxqrhrbCIPAGzTCrA17nCyrq3 CHdXCzOfrz7AnQPJZiHcrO/GeI8fbH2kw3lsC+f1jUIeu8Ce7AyUD6SZH9dbLeSHDAD7U/P+ NnjDkd41nGtAyEOwttmdp33hUs60kF+SNRxasOFoxAw1ulyEp0XwbrqYd++HBfqa7dq2z30I j2mYVrOC8wvqAHCyqQvLAq4F/8uKAKgADkw8K5cxrFc0k+jGSuVsfLTMLTRG3gDM/6hnQ7/c BF6vX20HJAEkVqIgY22IGJMmsEnydgAJRGInarptpkRh0qRkRhFzWREfxbDtwJlAJQ4iL+3c JTEpk8Yx1xgmllH8UwWEhZMSOMdHgVSf0ZmYusngNHt9TfZ8oNbdtJo7mizTNIV3soljaY4V gW0X7DNtRnel+z8n4tCUtfPKvbpzM1/VnY+Lj20khCnO7tQaDqY2BgRZe4j7YvxdRsp6nKdV twbtPK47WnnN3vy4Lve9uDjZEKr5ojEsa36KunefCj1dWewn0EpQNkLqeRhRsNI/Td9DXUMD AAA= X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFprIIsWRmVeSWpSXmKPExsVy+t/xe7r1AhviDFqfc1v0njvJZLFxxnpW i//bJjJbXPn6ns1i5eqjTBYL9ltbfLnykMli0+NrrBaXd81hs1h75C67xcEPT1gtTt39zO7A 47Fm3hpGj73fFrB43Lm2h81j+7cHrB73u48zeWxeUu9x+99jZo/JN5Yzeuy+2cDm0bdlFaPH 501yAdxRejZF+aUlqQoZ+cUltkrRhhZGeoaWFnpGJpZ6hsbmsVZGpkr6djYpqTmZZalF+nYJ ehnHD/9jK7gsUrHtwVz2BsYVgl2MnBwSAiYSs+73s4PYQgJLGSVezY2BiMtInJzWwAphC0v8 udbFBlHziVFieoMFiM0mYCjR9RYkzsUhItDJKDGt+yM7iMMscIJJ4vSMr2DdwgJeEr8nvQTr ZhFQlfi85jYziM0rYCsx4UsXI8QGeYnVGw4AxTk4OIHiM3vVIZblS9x9+o9lAiPfAkaGVYwi qaXFuem5xUZ6xYm5xaV56XrJ+bmbGIHRse3Yzy07GLveBR9iFOBgVOLh3fB1fZwQa2JZcWXu IUYJDmYlEd4dLUAh3pTEyqrUovz4otKc1OJDjKZAN01klhJNzgdGbl5JvKGpobmFpaG5sbmx mYWSOG+HwMEYIYH0xJLU7NTUgtQimD4mDk6pBsbNIkfXX3qY9v72YdG68hU6OwI0fqYdSHm3 qP2OuOXJoPV1HOm6Tu7rYyZInng2K+wDB3duzM8kW6ZVh5tipb4vcNF8I/c3ubnz/jKzxdl2 IVO+ec9k2uyVXrJb1aPH+eXGpwdmLy7bo+N26sm7vuNv3ioViuornMyadsQp8MYMRrbbHad5 6nqVWIozEg21mIuKEwF/RK8UpAIAAA== X-CMS-MailID: 20200504125423eucas1p24639a2eae17ebc634e022a6c7d448981 X-Msg-Generator: CA X-RootMTR: 20200504125423eucas1p24639a2eae17ebc634e022a6c7d448981 X-EPHeader: CA CMS-TYPE: 201P X-CMS-RootMailID: 20200504125423eucas1p24639a2eae17ebc634e022a6c7d448981 References: <20200504125017.5494-1-m.szyprowski@samsung.com> <20200504125359.5678-1-m.szyprowski@samsung.com> X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Direct Rendering Infrastructure - Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Bartlomiej Zolnierkiewicz , David Airlie , Robin Murphy , Christoph Hellwig , linux-arm-kernel@lists.infradead.org, Marek Szyprowski MIME-Version: 1.0 Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" The Documentation/DMA-API-HOWTO.txt states that dma_map_sg returns the numer of the created entries in the DMA address space. However the subsequent calls to dma_sync_sg_for_{device,cpu} and dma_unmap_sg must be called with the original number of entries passed to dma_map_sg. The sg_table->nents in turn holds the result of the dma_map_sg call as stated in include/linux/scatterlist.h. Adapt the code to obey those rules. Signed-off-by: Marek Szyprowski --- For more information, see '[PATCH v2 00/21] DRM: fix struct sg_table nents vs. orig_nents misuse' thread: https://lkml.org/lkml/2020/5/4/373 --- drivers/dma-buf/heaps/heap-helpers.c | 7 ++++--- drivers/dma-buf/udmabuf.c | 5 +++-- 2 files changed, 7 insertions(+), 5 deletions(-) -- 1.9.1 _______________________________________________ dri-devel mailing list dri-devel@lists.freedesktop.org https://lists.freedesktop.org/mailman/listinfo/dri-devel diff --git a/drivers/dma-buf/heaps/heap-helpers.c b/drivers/dma-buf/heaps/heap-helpers.c index 9f964ca..b923863 100644 --- a/drivers/dma-buf/heaps/heap-helpers.c +++ b/drivers/dma-buf/heaps/heap-helpers.c @@ -144,8 +144,9 @@ struct sg_table *dma_heap_map_dma_buf(struct dma_buf_attachment *attachment, table = &a->table; - if (!dma_map_sg(attachment->dev, table->sgl, table->nents, - direction)) + table->nents = dma_map_sg(attachment->dev, table->sgl, + table->orig_nents, direction); + if (!table->nents) table = ERR_PTR(-ENOMEM); return table; } @@ -154,7 +155,7 @@ static void dma_heap_unmap_dma_buf(struct dma_buf_attachment *attachment, struct sg_table *table, enum dma_data_direction direction) { - dma_unmap_sg(attachment->dev, table->sgl, table->nents, direction); + dma_unmap_sg(attachment->dev, table->sgl, table->orig_nents, direction); } static vm_fault_t dma_heap_vm_fault(struct vm_fault *vmf) diff --git a/drivers/dma-buf/udmabuf.c b/drivers/dma-buf/udmabuf.c index acb26c6..ea0cf71 100644 --- a/drivers/dma-buf/udmabuf.c +++ b/drivers/dma-buf/udmabuf.c @@ -63,7 +63,8 @@ static struct sg_table *get_sg_table(struct device *dev, struct dma_buf *buf, GFP_KERNEL); if (ret < 0) goto err; - if (!dma_map_sg(dev, sg->sgl, sg->nents, direction)) { + sg->nents = dma_map_sg(dev, sg->sgl, sg->orig_nents, direction); + if (!sg->nents) { ret = -EINVAL; goto err; } @@ -78,7 +79,7 @@ static struct sg_table *get_sg_table(struct device *dev, struct dma_buf *buf, static void put_sg_table(struct device *dev, struct sg_table *sg, enum dma_data_direction direction) { - dma_unmap_sg(dev, sg->sgl, sg->nents, direction); + dma_unmap_sg(dev, sg->sgl, sg->orig_nents, direction); sg_free_table(sg); kfree(sg); }