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avcodec/cbs_h266_syntax_template: bound slice width/height by remaining tiles

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Fixes: out of array access
Fixes: crash_vvc_heap_oob_read.bin

Found-by: akshay jain <akshaythe@gmail.com>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer
2026-02-19 00:30:54 +01:00
parent ea9e85e549
commit e5c1ca60d8
1 changed files with 2 additions and 2 deletions
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4
libavcodec/cbs_h266_syntax_template.c
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@@ -1973,14 +1973,14 @@ static int FUNC(pps) (CodedBitstreamContext *ctx, RWContext *rw,
tile_y = tile_idx / current->num_tile_columns;
if (tile_x != current->num_tile_columns - 1) {
ues(pps_slice_width_in_tiles_minus1[i],
0, current->num_tile_columns - 1, 1, i);
0, current->num_tile_columns - 1 - tile_x, 1, i);
} else {
infer(pps_slice_width_in_tiles_minus1[i], 0);
}
if (tile_y != current->num_tile_rows - 1 &&
(current->pps_tile_idx_delta_present_flag || tile_x == 0)) {
ues(pps_slice_height_in_tiles_minus1[i],
0, current->num_tile_rows - 1, 1, i);
0, current->num_tile_rows - 1 - tile_y, 1, i);
} else {
if (tile_y == current->num_tile_rows - 1)
infer(pps_slice_height_in_tiles_minus1[i], 0);