drm/nouveau/nouveau_bo: fix potential memory leak in nouveau_bo_alloc()

nouveau_bo_alloc() allocates a memory chunk for "nvbo" with kzalloc().
When some error occurs, "nvbo" should be released. But when
WARN_ON(pi < 0)) equals true, the function return ERR_PTR without
releasing the "nvbo", which will lead to a memory leak.

We should release the "nvbo" with kfree() if WARN_ON(pi < 0)) equals true.

Signed-off-by: Jianglei Nie <niejianglei2021@163.com>
Signed-off-by: Lyude Paul <lyude@redhat.com>
Reviewed-by: Lyude Paul <lyude@redhat.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220705094306.2244103-1-niejianglei2021@163.com

diff --git a/drivers/gpu/drm/nouveau/nouveau_bo.c b/drivers/gpu/drm/nouveau/nouveau_bo.c
index 05076e5..d088743 100644 (file)
--- a/drivers/gpu/drm/nouveau/nouveau_bo.c
+++ b/drivers/gpu/drm/nouveau/nouveau_bo.c
@@ -281,8 +281,10 @@ nouveau_bo_alloc(struct nouveau_cli *cli, u64 *size, int *align, u32 domain,
                        break;
        }
 
-       if (WARN_ON(pi < 0))
+       if (WARN_ON(pi < 0)) {
+               kfree(nvbo);
                return ERR_PTR(-EINVAL);
+       }
 
        /* Disable compression if suitable settings couldn't be found. */
        if (nvbo->comp && !vmm->page[pi].comp) {