[PATCH] drm/tegra: Add check for dma_alloc_coherent()

[Zeng Heng]

Since the dma_alloc_coherent() may return NULL,
the pointer returned needs to be checked to avoid
null-poineter dereference.

Fixes: 46f226c93d35 ("drm/tegra: Add NVDEC driver")
Signed-off-by: Zeng Heng <zengheng4 at huawei.com>
---
 drivers/gpu/drm/tegra/nvdec.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/gpu/drm/tegra/nvdec.c b/drivers/gpu/drm/tegra/nvdec.c
index 276fe0472730..4f667fb502d8 100644
--- a/drivers/gpu/drm/tegra/nvdec.c
+++ b/drivers/gpu/drm/tegra/nvdec.c
@@ -216,6 +216,8 @@ static int nvdec_load_firmware(struct nvdec *nvdec)
 	} else {
 		virt = tegra_drm_alloc(tegra, size, &iova);
 	}
+	if (IS_ERR_OR_NULL(virt))
+		return -ENOMEM;
 
 	nvdec->falcon.firmware.virt = virt;
 	nvdec->falcon.firmware.iova = iova;
-- 
2.25.1