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| author | Marek Szyprowski <m.szyprowski@samsung.com> | 2015-07-08 13:21:55 +0100 |
|---|---|---|
| committer | Russell King <rmk+kernel@arm.linux.org.uk> | 2015-07-17 15:08:40 +0100 |
| commit | 462859aa7bbe1ac83ec4377a0a06fe60778f3f27 (patch) | |
| tree | 2ba0b5f126402495b5a0925ce0283c23329420d0 /arch | |
| parent | 8e0c34b0d268f10d84cb3f79f59c140d545a553a (diff) | |
| download | lwn-462859aa7bbe1ac83ec4377a0a06fe60778f3f27.tar.gz lwn-462859aa7bbe1ac83ec4377a0a06fe60778f3f27.zip | |
ARM: 8404/1: dma-mapping: fix off-by-one error in bitmap size check
nr_bitmaps member of mapping structure stores the number of already
allocated bitmaps and it is interpreted as loop iterator (it starts from
0 not from 1), so a comparison against number of possible bitmap
extensions should include this fact. This patch fixes this by changing
the extension failure condition. This issue has been introduced by
commit 4d852ef8c2544ce21ae41414099a7504c61164a0 ("arm: dma-mapping: Add
support to extend DMA IOMMU mappings").
Reported-by: Hyungwon Hwang <human.hwang@samsung.com>
Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
Reviewed-by: Hyungwon Hwang <human.hwang@samsung.com>
Cc: stable@vger.kernel.org # v3.15+
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/arm/mm/dma-mapping.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/arm/mm/dma-mapping.c b/arch/arm/mm/dma-mapping.c index 1ced8a0f7a52..cba12f34ff77 100644 --- a/arch/arm/mm/dma-mapping.c +++ b/arch/arm/mm/dma-mapping.c @@ -1971,7 +1971,7 @@ static int extend_iommu_mapping(struct dma_iommu_mapping *mapping) { int next_bitmap; - if (mapping->nr_bitmaps > mapping->extensions) + if (mapping->nr_bitmaps >= mapping->extensions) return -EINVAL; next_bitmap = mapping->nr_bitmaps; |