diff options
| author | Nicholas Kazlauskas <nicholas.kazlauskas@amd.com> | 2018-08-03 17:40:20 +0300 |
|---|---|---|
| committer | Alex Deucher <alexander.deucher@amd.com> | 2018-08-14 01:29:44 +0300 |
| commit | dddc0557e3a02499ce336b1e2e67f5afaecccc80 (patch) | |
| tree | 04b7289bad3a6e91dabc2fc69bf05ea44c1089bc /drivers/gpu/drm/amd | |
| parent | 433149130c31de3f63b17b4ce08b45dab208f7e8 (diff) | |
| download | linux-dddc0557e3a02499ce336b1e2e67f5afaecccc80.tar.xz | |
drm/amd/display: Guard against null crtc in CRC IRQ
[Why]
A null pointer deference can occur if crtc is null in
amdgpu_dm_crtc_handle_crc_irq. This can happen if get_crtc_by_otg_inst
returns NULL during dm_crtc_high_irq, leading to a hang in some IGT
test cases.
[How]
Check that CRTC is non-null before accessing its fields.
Signed-off-by: Nicholas Kazlauskas <nicholas.kazlauskas@amd.com>
Reviewed-by: Sun peng Li <Sunpeng.Li@amd.com>
Acked-by: Leo Li <sunpeng.li@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Diffstat (limited to 'drivers/gpu/drm/amd')
| -rw-r--r-- | drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_crc.c | 10 |
1 files changed, 8 insertions, 2 deletions
diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_crc.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_crc.c index 52f2c01349e3..9bfb040352e9 100644 --- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_crc.c +++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_crc.c @@ -98,10 +98,16 @@ int amdgpu_dm_crtc_set_crc_source(struct drm_crtc *crtc, const char *src_name, */ void amdgpu_dm_crtc_handle_crc_irq(struct drm_crtc *crtc) { - struct dm_crtc_state *crtc_state = to_dm_crtc_state(crtc->state); - struct dc_stream_state *stream_state = crtc_state->stream; + struct dm_crtc_state *crtc_state; + struct dc_stream_state *stream_state; uint32_t crcs[3]; + if (crtc == NULL) + return; + + crtc_state = to_dm_crtc_state(crtc->state); + stream_state = crtc_state->stream; + /* Early return if CRC capture is not enabled. */ if (!crtc_state->crc_enabled) return; |