The buffer size is derived from parameters supplied by the userspace.
Having the size equal 0 causes allocation failure leading to kernel
panic.
Fix this by checking if size equals 0.
Fixes: 119f5173628a ("drm/mediatek: Add DRM Driver for Mediatek SoC MT8173.")
Signed-off-by: Hubert Mazur <hmazur@xxxxxxxxxxxx>
---
drivers/gpu/drm/mediatek/mtk_drm_gem.c | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/drivers/gpu/drm/mediatek/mtk_drm_gem.c b/drivers/gpu/drm/mediatek/mtk_drm_gem.c
index 9f364df52478..3b985b99d5c6 100644
--- a/drivers/gpu/drm/mediatek/mtk_drm_gem.c
+++ b/drivers/gpu/drm/mediatek/mtk_drm_gem.c
@@ -62,6 +62,11 @@ struct mtk_drm_gem_obj *mtk_drm_gem_create(struct drm_device *dev,
struct drm_gem_object *obj;
int ret;
+ if (size == 0) {
+ DRM_ERROR("Invalid allocation size: %zu", size);
+ return ERR_PTR(-EINVAL);
+ }
+
mtk_gem = mtk_drm_gem_init(dev, size);
if (IS_ERR(mtk_gem))
return ERR_CAST(mtk_gem);
--
2.42.0.515.g380fc7ccd1-goog
