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Check for values greater than or equal to the bitmap size so the caller does not depend on the exact failure sentinel. Signed-off-by: Yury Norov --- arch/arm/mm/dma-mapping.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/arch/arm/mm/dma-mapping.c b/arch/arm/mm/dma-mapping.c index f9bc53b60f99..7761099dde9e 100644 --- a/arch/arm/mm/dma-mapping.c +++ b/arch/arm/mm/dma-mapping.c @@ -773,7 +773,7 @@ static inline dma_addr_t __alloc_iova(struct dma_iommu_mapping *mapping, start = bitmap_find_next_zero_area(mapping->bitmaps[i], mapping->bits, 0, count, align); - if (start > mapping->bits) + if (start >= mapping->bits) continue; bitmap_set(mapping->bitmaps[i], start, count); @@ -794,7 +794,7 @@ static inline dma_addr_t __alloc_iova(struct dma_iommu_mapping *mapping, start = bitmap_find_next_zero_area(mapping->bitmaps[i], mapping->bits, 0, count, align); - if (start > mapping->bits) { + if (start >= mapping->bits) { spin_unlock_irqrestore(&mapping->lock, flags); return DMA_MAPPING_ERROR; } -- 2.53.0