From: Robin Murphy robin.murphy@arm.com
[ Upstream commit 5566174cb10a5167d59b0793871cab7990b149b8 ]
Upon failure, dma_alloc_coherent() returns NULL. If that does happen, passing some uninitialised stack contents to dma_mapping_error() - which belongs to a different API in the first place - has precious little chance of detecting it.
Also include the correct header, because the fragile transitive inclusion currently providing it is going to break soon.
Fixes: 20e7dce255e9 ("drm/tegra: Remove memory allocation from Falcon library") CC: Thierry Reding thierry.reding@gmail.com CC: Mikko Perttunen mperttunen@nvidia.com CC: dri-devel@lists.freedesktop.org Signed-off-by: Robin Murphy robin.murphy@arm.com Reviewed-by: Christoph Hellwig hch@lst.de Signed-off-by: Thierry Reding treding@nvidia.com Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/gpu/drm/tegra/vic.c | 7 +++---- 1 file changed, 3 insertions(+), 4 deletions(-)
diff --git a/drivers/gpu/drm/tegra/vic.c b/drivers/gpu/drm/tegra/vic.c index c02010ff2b7f2..da4af53719917 100644 --- a/drivers/gpu/drm/tegra/vic.c +++ b/drivers/gpu/drm/tegra/vic.c @@ -5,6 +5,7 @@
#include <linux/clk.h> #include <linux/delay.h> +#include <linux/dma-mapping.h> #include <linux/host1x.h> #include <linux/iommu.h> #include <linux/module.h> @@ -232,10 +233,8 @@ static int vic_load_firmware(struct vic *vic)
if (!client->group) { virt = dma_alloc_coherent(vic->dev, size, &iova, GFP_KERNEL); - - err = dma_mapping_error(vic->dev, iova); - if (err < 0) - return err; + if (!virt) + return -ENOMEM; } else { virt = tegra_drm_alloc(tegra, size, &iova); }