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RE: [PATCH] amdgpu: fix NULL pointer dereference at tonga_check_states_equal

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

Best Regards
Rex Zhu

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

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[PATCH] amdgpu: fix NULL pointer dereference at tonga_check_states_equal Bradley Pankow <btpankow@gmail.com> - 2016-02-23 02:20 +0100
  RE: [PATCH] amdgpu: fix NULL pointer dereference at  tonga_check_states_equal "Zhu, Rex" <Rex.Zhu@amd.com> - 2016-02-23 03:40 +0100
    Re: [PATCH] amdgpu: fix NULL pointer dereference at tonga_check_states_equal Alex Deucher <alexdeucher@gmail.com> - 2016-02-23 19:00 +0100

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