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| author |   Colin Ian King <colin.king@canonical.com> | 2018-11-20 17:17:45 +0000 |
|---|---|---|
| committer |   Alex Deucher <alexander.deucher@amd.com> | 2018-11-21 15:32:20 -0500 |
| commit | f8195e5910785218ed53bc7e522cb31dad26401b (patch) | |
| tree | 183cc2cc85c090a8bfed2558b7fa5e0e8115b9ce /drivers/gpu/drm/amd/display/modules | |
| parent | drm/amd/display/amdgpu_dm/amdgpu_dm.c: Remove duplicate header (diff) | |
| download | linux-dev-f8195e5910785218ed53bc7e522cb31dad26401b.tar.xz linux-dev-f8195e5910785218ed53bc7e522cb31dad26401b.zip | |
drm/amd/display: fix dereference of pointer fs_params before it is null checked
Currently there are several instances of pointer fs_params being
dereferenced before fs_params is being null checked. Fix this by
only dereferencing fs_params after the null check.
Detected by CoverityScan, CID#1475565 ("Dereference before null check")
Fixes: e1e8a020c6b8 ("drm/amd/display: Add support for Freesync 2 HDR and Content to Display Mapping")
Signed-off-by: Colin Ian King <colin.king@canonical.com>
Reviewed-by: Leo Li <sunpeng.li@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Diffstat (limited to 'drivers/gpu/drm/amd/display/modules')
| -rw-r--r-- | drivers/gpu/drm/amd/display/modules/color/color_gamma.c | 16 |
1 files changed, 11 insertions, 5 deletions
diff --git a/drivers/gpu/drm/amd/display/modules/color/color_gamma.c b/drivers/gpu/drm/amd/display/modules/color/color_gamma.c index 7480f072c375..bbecbaefb741 100644 --- a/drivers/gpu/drm/amd/display/modules/color/color_gamma.c +++ b/drivers/gpu/drm/amd/display/modules/color/color_gamma.c @@ -813,20 +813,26 @@ static bool build_freesync_hdr(struct pwl_float_data_ex *rgb_regamma, const struct hw_x_point *coord_x = coordinate_x; struct fixed31_32 scaledX = dc_fixpt_zero; struct fixed31_32 scaledX1 = dc_fixpt_zero; - struct fixed31_32 max_display = dc_fixpt_from_int(fs_params->max_display); - struct fixed31_32 min_display = dc_fixpt_from_fraction(fs_params->min_display, 10000); - struct fixed31_32 max_content = dc_fixpt_from_int(fs_params->max_content); - struct fixed31_32 min_content = dc_fixpt_from_fraction(fs_params->min_content, 10000); + struct fixed31_32 max_display; + struct fixed31_32 min_display; + struct fixed31_32 max_content; + struct fixed31_32 min_content; struct fixed31_32 clip = dc_fixpt_one; struct fixed31_32 output; bool use_eetf = false; bool is_clipped = false; - struct fixed31_32 sdr_white_level = dc_fixpt_from_int(fs_params->sdr_white_level); + struct fixed31_32 sdr_white_level; if (fs_params == NULL || fs_params->max_content == 0 || fs_params->max_display == 0) return false; + max_display = dc_fixpt_from_int(fs_params->max_display); + min_display = dc_fixpt_from_fraction(fs_params->min_display, 10000); + max_content = dc_fixpt_from_int(fs_params->max_content); + min_content = dc_fixpt_from_fraction(fs_params->min_content, 10000); + sdr_white_level = dc_fixpt_from_int(fs_params->sdr_white_level); + if (fs_params->min_display > 1000) // cap at 0.1 at the bottom min_display = dc_fixpt_from_fraction(1, 10); if (fs_params->max_display < 100) // cap at 100 at the top |