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ARM: 8816/1: dma-mapping: fix potential uninitialized return

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[ Upstream commit c2a3831df6 ]

While trying to use the dma_mmap_*() interface, it was noticed that this
interface returns strange values when passed an incorrect length.

If neither of the if() statements fire then the return value is
uninitialized. In the worst case it returns 0 which means the caller
will think the function succeeded.

Fixes: 1655cf8829 ("ARM: dma-mapping: Remove traces of NOMMU code")
Signed-off-by: Nathan Jones <nathanj439@gmail.com>
Reviewed-by: Robin Murphy <robin.murphy@arm.com>
Acked-by: Vladimir Murzin <vladimir.murzin@arm.com>
Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Nathan Jones
2018-12-04 10:05:32 +01:00
committed by Greg Kroah-Hartman
parent 5cb9667104
commit 80eaec9b94
1 changed files with 1 additions and 1 deletions
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2
arch/arm/mm/dma-mapping.c
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@@ -830,7 +830,7 @@ static int __arm_dma_mmap(struct device *dev, struct vm_area_struct *vma,
void *cpu_addr, dma_addr_t dma_addr, size_t size,
unsigned long attrs)
{
int ret;
int ret = -ENXIO;
unsigned long nr_vma_pages = vma_pages(vma);
unsigned long nr_pages = PAGE_ALIGN(size) >> PAGE_SHIFT;
unsigned long pfn = dma_to_pfn(dev, dma_addr);