linux-kernel - [PATCH] amdgpu: fix NULL pointer dereference at tonga_check_states

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Date:	Mon, 22 Feb 2016 20:11:47 -0500
From:	Bradley Pankow <btpankow@...il.com>
To:	Alex Deucher <alexander.deucher@....com>,
	Rex Zhu <Rex.Zhu@....com>, Jammy Zhou <Jammy.Zhou@....com>
Cc:	dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
	Bradley Pankow <btpankow@...il.com>
Subject: [PATCH] amdgpu: fix NULL pointer dereference at tonga_check_states_equal

The event_data passed from pem_fini was not cleared upon initialization.
This caused NULL checks to pass and cast_const_phw_tonga_power_state to
attempt to dereference an invalid pointer. Clear the event_data in
pem_init and pem_fini before calling pem_handle_event.

Signed-off-by: Bradley Pankow <btpankow@...il.com>
---
 drivers/gpu/drm/amd/powerplay/eventmgr/eventmgr.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/amd/powerplay/eventmgr/eventmgr.c b/drivers/gpu/drm/amd/powerplay/eventmgr/eventmgr.c
index 52a3efc..46410e3 100644
--- a/drivers/gpu/drm/amd/powerplay/eventmgr/eventmgr.c
+++ b/drivers/gpu/drm/amd/powerplay/eventmgr/eventmgr.c
@@ -31,7 +31,7 @@
 static int pem_init(struct pp_eventmgr *eventmgr)
 {
 	int result = 0;
-	struct pem_event_data event_data;
+	struct pem_event_data event_data = { {0} };
 
 	/* Initialize PowerPlay feature info */
 	pem_init_feature_info(eventmgr);
@@ -52,7 +52,7 @@ static int pem_init(struct pp_eventmgr *eventmgr)
 
 static void pem_fini(struct pp_eventmgr *eventmgr)
 {
-	struct pem_event_data event_data;
+	struct pem_event_data event_data = { {0} };
 
 	pem_uninit_featureInfo(eventmgr);
 	pem_unregister_interrupts(eventmgr);
-- 
2.7.1