From: Shirish S <shiris...@amd.com>
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 <shiris...@amd.com>
Reviewed-by: Roman Li <roman...@amd.com>
---
drivers/gpu/drm/amd/display/dc/dce110/dce110_hw_sequencer.c | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/drivers/gpu/drm/amd/display/dc/dce110/dce110_hw_sequencer.c
b/drivers/gpu/drm/amd/display/dc/dce110/dce110_hw_sequencer.c
index ee3b944..a6cd63a 100644
--- a/drivers/gpu/drm/amd/display/dc/dce110/dce110_hw_sequencer.c
+++ b/drivers/gpu/drm/amd/display/dc/dce110/dce110_hw_sequencer.c
@@ -1724,6 +1724,10 @@ 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;
--
2.7.4
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