From: Ezequiel Garcia <ezequiel@collabora.com> To: iommu@lists.linux-foundation.org, linux-media@vger.kernel.org Cc: Joerg Roedel <joro@8bytes.org>, Will Deacon <will@kernel.org>, Christoph Hellwig <hch@lst.de>, Tomasz Figa <tfiga@chromium.org>, Ricardo Ribalda <ribalda@chromium.org>, Ezequiel Garcia <ezequiel@collabora.com>, kernel@collabora.com, stable@vger.kernel.org Subject: [PATCH] iommu/dma: Fix leak in non-contiguous API Date: Thu, 22 Jul 2021 22:05:52 -0300 [thread overview] Message-ID: <20210723010552.50969-1-ezequiel@collabora.com> (raw) Currently, iommu_dma_alloc_noncontiguous() allocates a struct dma_sgt_handle object to hold some state needed for iommu_dma_free_noncontiguous(). However, the handle is neither freed nor returned explicitly by the ->alloc_noncontiguous method, and therefore seems leaked. This was found by code inspection, so please review carefully and test. As a side note, it appears the struct dma_sgt_handle type is exposed to users of the DMA-API by linux/dma-map-ops.h, but is has no users or functions returning the type explicitly. This may indicate it's a good idea to move the struct dma_sgt_handle type to drivers/iommu/dma-iommu.c. The decision is left to maintainers :-) Cc: stable@vger.kernel.org Fixes: e817ee5f2f95c ("dma-iommu: implement ->alloc_noncontiguous") Signed-off-by: Ezequiel Garcia <ezequiel@collabora.com> --- drivers/iommu/dma-iommu.c | 1 + 1 file changed, 1 insertion(+) diff --git a/drivers/iommu/dma-iommu.c b/drivers/iommu/dma-iommu.c index 4e34e8b26579..16c06a1aab80 100644 --- a/drivers/iommu/dma-iommu.c +++ b/drivers/iommu/dma-iommu.c @@ -768,6 +768,7 @@ static void iommu_dma_free_noncontiguous(struct device *dev, size_t size, __iommu_dma_unmap(dev, sgt->sgl->dma_address, size); __iommu_dma_free_pages(sh->pages, PAGE_ALIGN(size) >> PAGE_SHIFT); sg_free_table(&sh->sgt); + kfree(sh); } #endif /* CONFIG_DMA_REMAP */ -- 2.32.0
WARNING: multiple messages have this Message-ID (diff)
From: Ezequiel Garcia <ezequiel@collabora.com> To: iommu@lists.linux-foundation.org, linux-media@vger.kernel.org Cc: Will Deacon <will@kernel.org>, stable@vger.kernel.org, Ricardo Ribalda <ribalda@chromium.org>, kernel@collabora.com, Ezequiel Garcia <ezequiel@collabora.com>, Christoph Hellwig <hch@lst.de> Subject: [PATCH] iommu/dma: Fix leak in non-contiguous API Date: Thu, 22 Jul 2021 22:05:52 -0300 [thread overview] Message-ID: <20210723010552.50969-1-ezequiel@collabora.com> (raw) Currently, iommu_dma_alloc_noncontiguous() allocates a struct dma_sgt_handle object to hold some state needed for iommu_dma_free_noncontiguous(). However, the handle is neither freed nor returned explicitly by the ->alloc_noncontiguous method, and therefore seems leaked. This was found by code inspection, so please review carefully and test. As a side note, it appears the struct dma_sgt_handle type is exposed to users of the DMA-API by linux/dma-map-ops.h, but is has no users or functions returning the type explicitly. This may indicate it's a good idea to move the struct dma_sgt_handle type to drivers/iommu/dma-iommu.c. The decision is left to maintainers :-) Cc: stable@vger.kernel.org Fixes: e817ee5f2f95c ("dma-iommu: implement ->alloc_noncontiguous") Signed-off-by: Ezequiel Garcia <ezequiel@collabora.com> --- drivers/iommu/dma-iommu.c | 1 + 1 file changed, 1 insertion(+) diff --git a/drivers/iommu/dma-iommu.c b/drivers/iommu/dma-iommu.c index 4e34e8b26579..16c06a1aab80 100644 --- a/drivers/iommu/dma-iommu.c +++ b/drivers/iommu/dma-iommu.c @@ -768,6 +768,7 @@ static void iommu_dma_free_noncontiguous(struct device *dev, size_t size, __iommu_dma_unmap(dev, sgt->sgl->dma_address, size); __iommu_dma_free_pages(sh->pages, PAGE_ALIGN(size) >> PAGE_SHIFT); sg_free_table(&sh->sgt); + kfree(sh); } #endif /* CONFIG_DMA_REMAP */ -- 2.32.0 _______________________________________________ iommu mailing list iommu@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/iommu
next reply other threads:[~2021-07-23 1:06 UTC|newest] Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top 2021-07-23 1:05 Ezequiel Garcia [this message] 2021-07-23 1:05 ` [PATCH] iommu/dma: Fix leak in non-contiguous API Ezequiel Garcia 2021-07-23 5:09 ` Christoph Hellwig 2021-07-23 5:09 ` Christoph Hellwig 2021-07-26 12:27 ` Joerg Roedel 2021-07-26 12:27 ` Joerg Roedel
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