From: Harry Wentland <harry.wentland@amd.com>
Date: Fri, 10 Nov 2017 12:11:44 -0500
Subject: drm/amd/display: Fix use before NULL check in validate_timing
Git-commit: b001965d4eb5e4c0e3de7dc6dce1d45ca25232a7
Patch-mainline: v4.15-rc2
References: FATE#326289 FATE#326079 FATE#326049 FATE#322398 FATE#326166
Found by smatch:
drivers/gpu/drm/amd/amdgpu/../display/dc/dce110/dce110_timing_generator.c:1124
dce110_timing_generator_validate_timing() warn: variable dereferenced
before check 'timing' (see line 1116)
Signed-off-by: Harry Wentland <harry.wentland@amd.com>
Reviewed-by: Tony Cheng <Tony.Cheng@amd.com>
Acked-by: Harry Wentland <harry.wentland@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Acked-by: Petr Tesarik <ptesarik@suse.com>
---
drivers/gpu/drm/amd/display/dc/dce110/dce110_timing_generator.c | 8 ++++----
1 file changed, 4 insertions(+), 4 deletions(-)
--- a/drivers/gpu/drm/amd/display/dc/dce110/dce110_timing_generator.c
+++ b/drivers/gpu/drm/amd/display/dc/dce110/dce110_timing_generator.c
@@ -1112,10 +1112,7 @@ bool dce110_timing_generator_validate_ti
enum signal_type signal)
{
uint32_t h_blank;
- uint32_t h_back_porch;
- uint32_t hsync_offset = timing->h_border_right +
- timing->h_front_porch;
- uint32_t h_sync_start = timing->h_addressable + hsync_offset;
+ uint32_t h_back_porch, hsync_offset, h_sync_start;
struct dce110_timing_generator *tg110 = DCE110TG_FROM_TG(tg);
@@ -1124,6 +1121,9 @@ bool dce110_timing_generator_validate_ti
if (!timing)
return false;
+ hsync_offset = timing->h_border_right + timing->h_front_porch;
+ h_sync_start = timing->h_addressable + hsync_offset;
+
/* Currently we don't support 3D, so block all 3D timings */
if (timing->timing_3d_format != TIMING_3D_FORMAT_NONE)
return false;