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drm/amd/display: perform a bounds check before filling dirty rectangles

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commit af22d6a869 upstream.

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: 30ebe41582 ("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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Hamza Mahfooz
2023-06-21 15:19:05 -04:00
committed by Greg Kroah-Hartman
parent 0441c44154
commit d58fb94f24
1 changed files with 4 additions and 9 deletions
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13
drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
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@@ -4953,11 +4953,7 @@ static inline void fill_dc_dirty_rect(struct drm_plane *plane,
int32_t y, int32_t width, int32_t 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;
@@ -4973,7 +4969,6 @@ 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)++;
}
@@ -5055,6 +5050,9 @@ static void fill_dc_dirty_rects(struct drm_plane *plane,
new_plane_state->plane->base.id,
bb_changed, fb_changed, num_clips);
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,
@@ -5084,9 +5082,6 @@ 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;