From: Subash Patel <subash.rp@xxxxxxxxxxx>
exynos_pages_to_sg() internally calls sg_kmalloc() which can return
no pages when the system is under high memory crunch. One such instance
is chromeos-install in the chromeos. This patch adds check for the return
value of the function in subject to return NULL on failure.
Change-Id: I541ed30491a926ebe72738225041c9f2d88007bc
Signed-off-by: Subash Patel <subash.ramaswamy@xxxxxxxxxx>
CC: dri-devel@xxxxxxxxxxxxxxxxxxxxx
CC: linux-samsung-soc@xxxxxxxxxxxxxxx
CC: linaro-mm-sig@xxxxxxxxxxxxxxxx
CC: inki.dae@xxxxxxxxxxx
CC: airlied@xxxxxxxxxx
CC: olofj@xxxxxxxxxxxx
---
drivers/gpu/drm/exynos/exynos_drm_dmabuf.c | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/drivers/gpu/drm/exynos/exynos_drm_dmabuf.c b/drivers/gpu/drm/exynos/exynos_drm_dmabuf.c
index 97325c1..52cf761 100644
--- a/drivers/gpu/drm/exynos/exynos_drm_dmabuf.c
+++ b/drivers/gpu/drm/exynos/exynos_drm_dmabuf.c
@@ -87,6 +87,10 @@ static struct sg_table *
npages = buf->size / buf->page_size;
sgt = exynos_pages_to_sg(buf->pages, npages, buf->page_size);
+ if (!sgt) {
+ DRM_DEBUG_PRIME("exynos_pages_to_sg returned NULL!\n");
+ goto err_unlock;
+ }
nents = dma_map_sg(attach->dev, sgt->sgl, sgt->nents, dir);
DRM_DEBUG_PRIME("npages = %d buffer size = 0x%lx page_size = 0x%lx\n",
--
1.7.9.5
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