[Intel-gfx] [PATCH] drm/i915: Avoid drm_atomic_state_put(NULL) on error paths

[Chris Wilson]

On Wed, Jan 18, 2017 at 02:34:28PM +0200, Ander Conselvan de Oliveira wrote:
> The error paths in hsw_trans_edp_pipe_A_crc_wa() and
> intel_prepare_reset() would potentially call drm_atomic_state_put with a
> NULL state, which would lead to a NULL pointer dereference.
> 
> Found by coverity.
> 
> v2: Improve the error paths. (Chris)
> 
> Fixes: 0853695c3ba4 ("drm: Add reference counting to drm_atomic_state")
> Cc: Chris Wilson <chris at chris-wilson.co.uk>
> Cc: Daniel Vetter <daniel.vetter at ffwll.ch>
> Cc: <drm-intel-fixes at lists.freedesktop.org> # v4.10-rc1+
> Signed-off-by: Ander Conselvan de Oliveira <ander.conselvan.de.oliveira at intel.com>
Reviewed-by: Chris Wilson <chris at chris-wilson.co.uk>
-Chris

-- 
Chris Wilson, Intel Open Source Technology Centre