linux-kernel - [PATCH 3.12 077/123] drm/qxl: Do not leak memory if qxl_release_list

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Message-Id: <978db86546925bb87ac0672f3290b6d8d83c4639.1438699154.git.jslaby@suse.cz>
Date:	Tue,  4 Aug 2015 16:40:21 +0200
From:	Jiri Slaby <jslaby@...e.cz>
To:	stable@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, Frediano Ziglio <fziglio@...hat.com>,
	Dave Airlie <airlied@...hat.com>, Jiri Slaby <jslaby@...e.cz>
Subject: [PATCH 3.12 077/123] drm/qxl: Do not leak memory if qxl_release_list_add fails

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

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

===============

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: Jiri Slaby <jslaby@...e.cz>
---
 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 7b95c75e9626..729debf83fa3 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;
 }
-- 
2.5.0

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