* [FFmpeg-devel] [PR] avcodec/cbs_h266_syntax_template: Bound num_tile_columns/rows (PR #21791)
@ 2026-02-19 2:29 michaelni via ffmpeg-devel
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From: michaelni via ffmpeg-devel @ 2026-02-19 2:29 UTC (permalink / raw)
To: ffmpeg-devel; +Cc: michaelni
PR #21791 opened by michaelni
URL: https://code.ffmpeg.org/FFmpeg/FFmpeg/pulls/21791
Patch URL: https://code.ffmpeg.org/FFmpeg/FFmpeg/pulls/21791.patch
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>
>From a832972cf624278bd31d4bb31d54492ae6514b7d Mon Sep 17 00:00:00 2001
From: Michael Niedermayer <michael@niedermayer.cc>
Date: Thu, 19 Feb 2026 00:30:54 +0100
Subject: [PATCH] avcodec/cbs_h266_syntax_template: Bound num_tile_columns/rows
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>
---
libavcodec/cbs_h266_syntax_template.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/libavcodec/cbs_h266_syntax_template.c b/libavcodec/cbs_h266_syntax_template.c
index 4f6ae76e27..4fc82704d1 100644
--- a/libavcodec/cbs_h266_syntax_template.c
+++ b/libavcodec/cbs_h266_syntax_template.c
@@ -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);
--
2.52.0
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2026-02-19 2:29 [FFmpeg-devel] [PR] avcodec/cbs_h266_syntax_template: Bound num_tile_columns/rows (PR #21791) michaelni via ffmpeg-devel
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