This patch fixes incorrect check in error path. When the allocation of first page fails, the kernel ops appears due to accessing -1 element of the pages array.

Reported-by: Sylwester Nawrocki s.nawrocki@samsung.com Signed-off-by: Marek Szyprowski m.szyprowski@samsung.com --- 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 7a1d224..3096ed2 100644 --- a/arch/arm/mm/dma-mapping.c +++ b/arch/arm/mm/dma-mapping.c @@ -977,7 +977,7 @@ static struct page **__iommu_alloc_buffer(struct device *dev, size_t size, gfp_t

return pages; error: - while (--i) + while (i--) if (pages[i]) __free_pages(pages[i], 0); if (array_size <= PAGE_SIZE)