On Fri, Jan 20, 2017 at 04:28:45PM +0200, Ander Conselvan de Oliveira wrote:
> In intel_crtc_disable_noatomic(), bail on a failure to allocate an
> atomic state to avoid a NULL pointer dereference.
>
> Found by coverity.
>
> Fixes: 4a80655827af ("drm/i915: Pass atomic state to crtc enable/disable functions")
> Cc: Maarten Lankhorst <maarten.lankhorst@xxxxxxxxxxxxxxx>
> Cc: Daniel Vetter <daniel.vetter@xxxxxxxx>
> Cc: Daniel Vetter <daniel.vetter@xxxxxxxxx>
> Cc: Jani Nikula <jani.nikula@xxxxxxxxxxxxxxx>
> Cc: intel-gfx@xxxxxxxxxxxxxxxxxxxxx
> Cc: <stable@xxxxxxxxxxxxxxx> # v4.9+
> Signed-off-by: Ander Conselvan de Oliveira <ander.conselvan.de.oliveira@xxxxxxxxx>
Reviewed-by: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
> ---
> drivers/gpu/drm/i915/intel_display.c | 6 ++++++
> 1 file changed, 6 insertions(+)
>
> diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
> index 0759e8b..38d5178 100644
> --- a/drivers/gpu/drm/i915/intel_display.c
> +++ b/drivers/gpu/drm/i915/intel_display.c
> @@ -6882,6 +6882,12 @@ static void intel_crtc_disable_noatomic(struct drm_crtc *crtc)
> }
>
> state = drm_atomic_state_alloc(crtc->dev);
> + if (!state) {
> + DRM_DEBUG_KMS("failed to disable [CRTC:%d:%s], out of memory",
> + crtc->base.id, crtc->name);
> + return;
> + }
> +
> state->acquire_ctx = crtc->dev->mode_config.acquire_ctx;
>
> /* Everything's already locked, -EDEADLK can't happen. */
> --
> 2.5.5
>
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--
Ville Syrjälä
Intel OTC
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