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drm/tegra: gem: Check before freeing CMA memory

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dma_free_writecombine() must not be called on a buffer that couldn't be
allocated. Check for a valid virtual address before attempting to free
the memory to avoid a crash.

Reported-by: Sean Paul <seanpaul@chromium.org>
Reviewed-by: Sean Paul <seanpaul@chromium.org>
Signed-off-by: Thierry Reding <treding@nvidia.com>
This commit is contained in:
Thierry Reding 2014-11-06 14:41:31 +01:00
parent cb10c81fdf
commit 7e0180e357
1 changed files with 1 additions and 1 deletions
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2
drivers/gpu/drm/tegra/gem.c
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@ -210,7 +210,7 @@ static void tegra_bo_free(struct drm_device *drm, struct tegra_bo *bo)
drm_gem_put_pages(&bo->gem, bo->pages, true, true);
sg_free_table(bo->sgt);
kfree(bo->sgt);
} else {
} else if (bo->vaddr) {
dma_free_writecombine(drm->dev, bo->gem.size, bo->vaddr,
bo->paddr);
}