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[media] exynos4-is: Free FIMC-IS CPU memory only when allocated

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Ensure dma_free_coherent() is not called with incorrect arguments
and only when the memory was actually allocated. This will prevent
possible crashes on error paths of the top level media device driver,
when fimc-is device gets unregistered and its driver detached.

Signed-off-by: Sylwester Nawrocki <s.nawrocki@samsung.com>
Acked-by: Kyungmin Park <kyungmin.park@samsung.com>
Cc: stable@vger.kernel.org # for v3.15
Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>
This commit is contained in:
Sylwester Nawrocki 2014-05-08 14:35:15 -03:00 committed by Mauro Carvalho Chehab
parent f486e7c3cb
commit 404a90abc6
1 changed files with 3 additions and 0 deletions
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3
drivers/media/platform/exynos4-is/fimc-is.c
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@ -367,6 +367,9 @@ static void fimc_is_free_cpu_memory(struct fimc_is *is)
{
struct device *dev = &is->pdev->dev;
if (is->memory.vaddr == NULL)
return;
dma_free_coherent(dev, is->memory.size, is->memory.vaddr,
is->memory.paddr);
}