[PATCH 5.4 210/255] drm/nouveau/nouveau_bo: fix potential memory leak in nouveau_bo_alloc()

From: Greg Kroah-Hartman
Date: Mon Oct 24 2022 - 12:16:56 EST


From: Jianglei Nie <niejianglei2021@xxxxxxx>

[ Upstream commit 6dc548745d5b5102e3c53dc5097296ac270b6c69 ]

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@xxxxxxx>
Signed-off-by: Lyude Paul <lyude@xxxxxxxxxx>
Reviewed-by: Lyude Paul <lyude@xxxxxxxxxx>
Link: https://patchwork.freedesktop.org/patch/msgid/20220705094306.2244103-1-niejianglei2021@xxxxxxx
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
drivers/gpu/drm/nouveau/nouveau_bo.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/nouveau/nouveau_bo.c b/drivers/gpu/drm/nouveau/nouveau_bo.c
index f7603be569fc..9f9c70734180 100644
--- a/drivers/gpu/drm/nouveau/nouveau_bo.c
+++ b/drivers/gpu/drm/nouveau/nouveau_bo.c
@@ -276,8 +276,10 @@ nouveau_bo_alloc(struct nouveau_cli *cli, u64 *size, int *align, u32 flags,
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) {
--
2.35.1