diff options
| author | Michael Niedermayer <michael@niedermayer.cc> | 2022-08-15 01:02:37 +0300 |
|---|---|---|
| committer | Michael Niedermayer <michael@niedermayer.cc> | 2022-10-09 22:33:01 +0300 |
| commit | 457941c11ad8b2490d71837d5e17a4d3b4ec77fe (patch) | |
| tree | c3792f8976b0117e695b06c0e0e2eacd626830df | |
| parent | 85f1286c8f4ed33f3ed43cc28d5dda044e1764ca (diff) | |
avcodec/h263dec: Sanity check against minimal I/P frame size
Fixes: Timeout
Fixes: 49718/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_MPEG4_fuzzer-4874987894341632
Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
(cherry picked from commit ca4ff9c21cb77e024fa4ff5889826a8bee4d0e0a)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
| -rw-r--r-- | libavcodec/h263dec.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/libavcodec/h263dec.c b/libavcodec/h263dec.c index 8ee844e298..2b64cb5b3b 100644 --- a/libavcodec/h263dec.c +++ b/libavcodec/h263dec.c @@ -544,6 +544,8 @@ retry: avctx->has_b_frames = !s->low_delay; if (CONFIG_MPEG4_DECODER && avctx->codec_id == AV_CODEC_ID_MPEG4) { + if (s->pict_type != AV_PICTURE_TYPE_B && s->mb_num/2 > get_bits_left(&s->gb)) + return AVERROR_INVALIDDATA; if (ff_mpeg4_workaround_bugs(avctx) == 1) goto retry; if (s->studio_profile != (s->idsp.idct == NULL)) |