From: Martin Peres <martin.peres@free.fr>
Date: Wed, 18 Jan 2017 21:49:21 +0000 (+0200)
Subject: drm/nouveau/drm/nouveau/led: prevent a possible use-after-free
X-Git-Url: http://git.lede-project.org./?a=commitdiff_plain;h=ca33fafdc9020720a9773fd416c94fe68aef7220;p=openwrt%2Fstaging%2Fblogic.git

drm/nouveau/drm/nouveau/led: prevent a possible use-after-free

If the led class registration fails, we free drm->led but do not reset
it to NULL, which means that the suspend/resume/fini function will act
as if everything went well in init() and will likely crash the kernel.

This patch adds the missing drm->led = NULL.

Reported-by: Emmanuel Pescosta <emmanuelpescosta099@gmail.com>
Signed-off-by: Martin Peres <martin.peres@free.fr>
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
---

diff --git a/drivers/gpu/drm/nouveau/nouveau_led.c b/drivers/gpu/drm/nouveau/nouveau_led.c
index 72456b1693a4..2c5e0628da12 100644
--- a/drivers/gpu/drm/nouveau/nouveau_led.c
+++ b/drivers/gpu/drm/nouveau/nouveau_led.c
@@ -102,6 +102,7 @@ nouveau_led_init(struct drm_device *dev)
 	ret = led_classdev_register(dev->dev, &drm->led->led);
 	if (ret) {
 		kfree(drm->led);
+		drm->led = NULL;
 		return ret;
 	}