drm/mediatek: Fix potential memory leak if vmap() fail

Also return -ENOMEM if such a failure happens, the implement should take
responsibility for the error handling.

Fixes: 3df64d7b0a4f ("drm/mediatek: Implement gem prime vmap/vunmap function")
Reviewed-by: Matthias Brugger <matthias.bgg@gmail.com>
Reviewed-by: Alexandre Mergnat <amergnat@baylibre.com>
Signed-off-by: Sui Jingfeng <suijingfeng@loongson.cn>
Reviewed-by: CK Hu <ck.hu@mediatek.com>
Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Link: https://patchwork.kernel.org/project/dri-devel/patch/20230706134000.130098-1-suijingfeng@loongson.cn/
Signed-off-by: Chun-Kuang Hu <chunkuang.hu@kernel.org>

diff --git a/drivers/gpu/drm/mediatek/mtk_drm_gem.c b/drivers/gpu/drm/mediatek/mtk_drm_gem.c
index a25b28d..9f364df 100644 (file)
--- a/drivers/gpu/drm/mediatek/mtk_drm_gem.c
+++ b/drivers/gpu/drm/mediatek/mtk_drm_gem.c
@@ -247,7 +247,11 @@ int mtk_drm_gem_prime_vmap(struct drm_gem_object *obj, struct iosys_map *map)
 
        mtk_gem->kvaddr = vmap(mtk_gem->pages, npages, VM_MAP,
                               pgprot_writecombine(PAGE_KERNEL));
-
+       if (!mtk_gem->kvaddr) {
+               kfree(sgt);
+               kfree(mtk_gem->pages);
+               return -ENOMEM;
+       }
 out:
        kfree(sgt);
        iosys_map_set_vaddr(map, mtk_gem->kvaddr);