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ARM: 8404/1: dma-mapping: fix off-by-one error in bitmap size check

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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 4d852ef8c2 ("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>
This commit is contained in:
Marek Szyprowski 2015-07-08 13:21:55 +01:00 committed by Russell King
parent 8e0c34b0d2
commit 462859aa7b
1 changed files with 1 additions and 1 deletions
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2
arch/arm/mm/dma-mapping.c
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@ -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;