linux-kernel - [PATCH] drm/nouveau/nouveau_bo: fix potential memory leak in nouveau_bo

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Date:   Tue,  5 Jul 2022 17:43:06 +0800
From:   Jianglei Nie <niejianglei2021@....com>
To:     bskeggs@...hat.com, kherbst@...hat.com, lyude@...hat.com,
        airlied@...ux.ie, daniel@...ll.ch
Cc:     ri-devel@...ts.freedesktop.org, nouveau@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org,
        Jianglei Nie <niejianglei2021@....com>
Subject: [PATCH] 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@....com>
---
 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 05076e530e7d..d0887438b07e 100644
--- 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) {
-- 
2.25.1