[PATCH 5.19 334/717] drm/vmwgfx: Fix memory leak in vmw_mksstat_add_ioctl()

Greg Kroah-Hartman
2022-10-22T08:05:14Z

From: Rafael Mendonca <rafaelmendsr@gmail.com>

[ Upstream commit a40c7f61d12fbd1e785e59140b9efd57127c0c33 ]

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@gmail.com>
Reviewed-by: Martin Krastev <krastevm@vmware.com>
Signed-off-by: Zack Rusin <zackr@vmware.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220916204751.720716-1-rafaelmendsr@gmail.com
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
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;
}

--
2.35.1