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authorShirish S <shirish.s@amd.com>2017-11-20 06:07:08 +0100
committerAlex Deucher <alexander.deucher@amd.com>2017-11-28 23:55:33 +0100
commit93984bbc70b3f321b8f6a3ec303e31b084e54230 (patch)
treeec98f14608bed8c9923ef901a0572f1749377b33 /drivers
parentdrm/amd/display: Do DC mode-change check when adding CRTCs (diff)
downloadlinux-93984bbc70b3f321b8f6a3ec303e31b084e54230.tar.xz
linux-93984bbc70b3f321b8f6a3ec303e31b084e54230.zip
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>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/gpu/drm/amd/display/dc/dce110/dce110_hw_sequencer.c4
1 files changed, 4 insertions, 0 deletions
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 be14a2665072..c3de7f305cd3 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
@@ -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;