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drm/i915: Fix possible NULL pointer dereferences in i9xx_update_wm() 

Check return pointer from intel_crtc_for_plane() before dereferencing
it, as it can be NULL.

v2: Moved the NULL check into intel_crtc_active().

Cc: Jani Nikula <jani.nikula@intel.com>
Cc: Caz Yokoyama <caz.yokoyama@intel.com>
Cc: Radhakrishna Sripada <radhakrishna.sripada@intel.com>
Signed-off-by: Harish Chegondi <harish.chegondi@intel.com>
Reviewed-by: Jani Nikula <jani.nikula@intel.com>
Signed-off-by: Matt Roper <matthew.d.roper@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20211217160255.1300348-1-harish.chegondi@intel.com
This commit is contained in:
Harish Chegondi 2021-12-17 08:02:55 -08:00 committed by Matt Roper
parent 80dfdeb750
commit 814d5c51f8
1 changed files with 1 additions and 1 deletions
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2
drivers/gpu/drm/i915/intel_pm.c
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@ -877,7 +877,7 @@ static bool intel_crtc_active(struct intel_crtc *crtc)
* crtc->state->active once we have proper CRTC states wired up
* for atomic.
*/
return crtc->active && crtc->base.primary->state->fb &&
return crtc && crtc->active && crtc->base.primary->state->fb &&
crtc->config->hw.adjusted_mode.crtc_clock;
}