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drm/amd/display: check plane state before validating fbc 

While validation fbc, array_mode of the pipe is accessed
without checking plane_state exists for it.
Causing to null pointer dereferencing followed by
reboot when a crtc associated with external display(not
connected) is page flipped.

This patch adds a check for plane_state before using
it to validate fbc.

Signed-off-by: Shirish S <shirish.s@amd.com>
Reviewed-by: Roman Li <Roman.Li@amd.com>
Reviewed-by: Harry Wentland <harry.wentland@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Shirish S 2017-11-20 10:37:08 +05:30 committed by Alex Deucher
parent 8ffca5dca0
commit 93984bbc70
1 changed files with 4 additions and 0 deletions
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4
drivers/gpu/drm/amd/display/dc/dce110/dce110_hw_sequencer.c
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@ -1774,6 +1774,10 @@ static enum dc_status validate_fbc(struct dc *dc,
if (pipe_ctx->stream->sink->link->psr_enabled)
return DC_ERROR_UNEXPECTED;
/* Nothing to compress */
if (!pipe_ctx->plane_state)
return DC_ERROR_UNEXPECTED;
/* Only for non-linear tiling */
if (pipe_ctx->plane_state->tiling_info.gfx8.array_mode == DC_ARRAY_LINEAR_GENERAL)
return DC_ERROR_UNEXPECTED;