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

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Date:	Tue, 23 Feb 2016 02:21:52 +0000
From:	"Zhu, Rex" <Rex.Zhu@....com>
To:	Bradley Pankow <btpankow@...il.com>,
	"Deucher, Alexander" <Alexander.Deucher@....com>
CC:	"dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH] amdgpu: fix NULL pointer dereference at
 tonga_check_states_equal


Reviewed-by:  Rex Zhu <Rex.Zhu@....com>

Best Regards
Rex Zhu

-----Original Message-----
From: Bradley Pankow [mailto:btpankow@...il.com] 
Sent: Tuesday, February 23, 2016 9:12 AM
To: Deucher, Alexander; Zhu, Rex; Zhou, Jammy
Cc: dri-devel@...ts.freedesktop.org; linux-kernel@...r.kernel.org; Bradley Pankow
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