[FFmpeg-cvslog] avcodec/cbs_apv_syntax_template: Check tile_data_size

[Michael Niedermayer]

ffmpeg | branch: master | Michael Niedermayer <michael at niedermayer.cc> | Sat Jun 21 23:15:21 2025 +0200| [f09c834a7d01dfde9369551b2767c001846a396f] | committer: Michael Niedermayer

avcodec/cbs_apv_syntax_template: Check tile_data_size

Fixes: heap-buffer-overflow
Fixes: 418421333/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_APV_fuzzer-6592025183191040
Fixes: 418804929/clusterfuzz-testcase-minimized-ffmpeg_BSF_APV_METADATA_fuzzer-5773904646045696
Fixes: 420737045/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_APV_fuzzer-5535272169439232

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=f09c834a7d01dfde9369551b2767c001846a396f
---

 libavcodec/cbs_apv_syntax_template.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/libavcodec/cbs_apv_syntax_template.c b/libavcodec/cbs_apv_syntax_template.c
index fc8a08ff31..b84565b107 100644
--- a/libavcodec/cbs_apv_syntax_template.c
+++ b/libavcodec/cbs_apv_syntax_template.c
@@ -236,6 +236,8 @@ static int FUNC(tile)(CodedBitstreamContext *ctx, RWContext *rw,
 #ifdef READ
         int pos = get_bits_count(rw);
         av_assert0(pos % 8 == 0);
+        if (get_bits_left(rw) < 8LL * comp_size)
+            return AVERROR_INVALIDDATA;
         current->tile_data[c] = (uint8_t*)align_get_bits(rw);
         skip_bits_long(rw, 8 * comp_size);
 #else