linux-kernel - [PATCH] drm/vmwgfx: Fix memory leak in vmw_mksstat_add

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Date:   Fri, 16 Sep 2022 17:47:51 -0300
From:   Rafael Mendonca <rafaelmendsr@...il.com>
To:     Zack Rusin <zackr@...are.com>,
        VMware Graphics Reviewers 
        <linux-graphics-maintainer@...are.com>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Martin Krastev <krastevm@...are.com>
Cc:     Rafael Mendonca <rafaelmendsr@...il.com>,
        dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: [PATCH] drm/vmwgfx: Fix memory leak in vmw_mksstat_add_ioctl()

If the copy of the description string from userspace fails, then the page
for the instance descriptor doesn't get freed before returning -EFAULT,
which leads to a memleak.

Fixes: 7a7a933edd6c ("drm/vmwgfx: Introduce VMware mks-guest-stats")
Signed-off-by: Rafael Mendonca <rafaelmendsr@...il.com>
---
 drivers/gpu/drm/vmwgfx/vmwgfx_msg.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_msg.c b/drivers/gpu/drm/vmwgfx/vmwgfx_msg.c
index 2aceac7856e2..089046fa21be 100644
--- a/drivers/gpu/drm/vmwgfx/vmwgfx_msg.c
+++ b/drivers/gpu/drm/vmwgfx/vmwgfx_msg.c
@@ -1076,6 +1076,7 @@ int vmw_mksstat_add_ioctl(struct drm_device *dev, void *data,
 
 	if (desc_len < 0) {
 		atomic_set(&dev_priv->mksstat_user_pids[slot], 0);
+		__free_page(page);
 		return -EFAULT;
 	}
 
-- 
2.34.1