diff options
| author | Hamza Mahfooz <hamza.mahfooz@amd.com> | 2023-06-21 15:19:05 -0400 |
|---|---|---|
| committer | Alex Deucher <alexander.deucher@amd.com> | 2023-06-30 13:11:35 -0400 |
| commit | af22d6a869cc26b519bfdcd54293c53f2e491870 (patch) | |
| tree | f1b7ac36222297ec615400eff292ff9057e06a2d /drivers/gpu | |
| parent | 8ef84c1a68a83440b62f78a24f64ab100f6bff7a (diff) | |
drm/amd/display: perform a bounds check before filling dirty rectangles
Currently, it is possible for us to access memory that we shouldn't.
Since, we acquire (possibly dangling) pointers to dirty rectangles
before doing a bounds check to make sure we can actually accommodate the
number of dirty rectangles userspace has requested to fill. This issue
is especially evident if a compositor requests both MPO and damage clips
at the same time, in which case I have observed a soft-hang. So, to
avoid this issue, perform the bounds check before filling a single dirty
rectangle and WARN() about it, if it is ever attempted in
fill_dc_dirty_rect().
Cc: stable@vger.kernel.org # 6.1+
Fixes: 30ebe41582d1 ("drm/amd/display: add FB_DAMAGE_CLIPS support")
Reviewed-by: Leo Li <sunpeng.li@amd.com>
Signed-off-by: Hamza Mahfooz <hamza.mahfooz@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Diffstat (limited to 'drivers/gpu')
| -rw-r--r-- | drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c | 13 |
1 files changed, 4 insertions, 9 deletions
diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c index 514f6785a020..7fa0d0ec45c9 100644 --- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c +++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c @@ -5063,11 +5063,7 @@ static inline void fill_dc_dirty_rect(struct drm_plane *plane, s32 y, s32 width, s32 height, int *i, bool ffu) { - if (*i > DC_MAX_DIRTY_RECTS) - return; - - if (*i == DC_MAX_DIRTY_RECTS) - goto out; + WARN_ON(*i >= DC_MAX_DIRTY_RECTS); dirty_rect->x = x; dirty_rect->y = y; @@ -5083,7 +5079,6 @@ static inline void fill_dc_dirty_rect(struct drm_plane *plane, "[PLANE:%d] PSR SU dirty rect at (%d, %d) size (%d, %d)", plane->base.id, x, y, width, height); -out: (*i)++; } @@ -5170,6 +5165,9 @@ static void fill_dc_dirty_rects(struct drm_plane *plane, *dirty_regions_changed = bb_changed; + if ((num_clips + (bb_changed ? 2 : 0)) > DC_MAX_DIRTY_RECTS) + goto ffu; + if (bb_changed) { fill_dc_dirty_rect(new_plane_state->plane, &dirty_rects[i], new_plane_state->crtc_x, @@ -5199,9 +5197,6 @@ static void fill_dc_dirty_rects(struct drm_plane *plane, new_plane_state->crtc_h, &i, false); } - if (i > DC_MAX_DIRTY_RECTS) - goto ffu; - flip_addrs->dirty_rect_count = i; return; |