linux-kernel - [PATCH 3.16.y-ckt 050/185] drm/qxl: Do not leak memory if qxl_release_list

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Message-Id: <1436951580-15977-51-git-send-email-luis.henriques@canonical.com>
Date:	Wed, 15 Jul 2015 10:10:45 +0100
From:	Luis Henriques <luis.henriques@...onical.com>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	kernel-team@...ts.ubuntu.com
Cc:	Frediano Ziglio <fziglio@...hat.com>,
	Dave Airlie <airlied@...hat.com>,
	Luis Henriques <luis.henriques@...onical.com>
Subject: [PATCH 3.16.y-ckt 050/185] drm/qxl: Do not leak memory if qxl_release_list_add fails

3.16.7-ckt15 -stable review patch.  If anyone has any objections, please let me know.

------------------

From: Frediano Ziglio <fziglio@...hat.com>

commit 8451cc964c1d193b989c41a44e5e77109cc696f8 upstream.

If the function fails reference counter to the object is not decremented
causing leaks.
This is hard to spot as it happens only on very low memory situations.

Signed-off-by: Frediano Ziglio <fziglio@...hat.com>
Reviewed-by: Dave Airlie <airlied@...hat.com>
Signed-off-by: Dave Airlie <airlied@...hat.com>
Signed-off-by: Luis Henriques <luis.henriques@...onical.com>
---
 drivers/gpu/drm/qxl/qxl_ioctl.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/qxl/qxl_ioctl.c b/drivers/gpu/drm/qxl/qxl_ioctl.c
index b110883f8253..7354a4cda59d 100644
--- a/drivers/gpu/drm/qxl/qxl_ioctl.c
+++ b/drivers/gpu/drm/qxl/qxl_ioctl.c
@@ -122,8 +122,10 @@ static struct qxl_bo *qxlhw_handle_to_bo(struct qxl_device *qdev,
 	qobj = gem_to_qxl_bo(gobj);
 
 	ret = qxl_release_list_add(release, qobj);
-	if (ret)
+	if (ret) {
+		drm_gem_object_unreference_unlocked(gobj);
 		return NULL;
+	}
 
 	return qobj;
 }
--
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