diff options
| author | Michael Niedermayer <michael@niedermayer.cc> | 2021-08-31 20:15:09 +0200 |
|---|---|---|
| committer | Michael Niedermayer <michael@niedermayer.cc> | 2021-09-17 19:56:05 +0200 |
| commit | 5a95abcce4d93f979e4b53f2220f7a54edd03312 (patch) | |
| tree | aa9226fc24355a30042956f144b6f13acd2f6cab /libavcodec | |
| parent | 245017ec8a87d6e4c764d06afeca37100b980d85 (diff) | |
avcodec/mpeg12dec: Do not put mpeg_f_code into an invalid state on error return
Fixes: invalid shift
Fixes: 37018/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_MPEG2VIDEO_fuzzer-5290280902328320
Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
Diffstat (limited to 'libavcodec')
| -rw-r--r-- | libavcodec/mpeg12dec.c | 8 |
1 files changed, 4 insertions, 4 deletions
diff --git a/libavcodec/mpeg12dec.c b/libavcodec/mpeg12dec.c index 49d865853b..507a271073 100644 --- a/libavcodec/mpeg12dec.c +++ b/libavcodec/mpeg12dec.c @@ -1538,6 +1538,10 @@ static int mpeg_decode_picture_coding_extension(Mpeg1Context *s1) s->mpeg_f_code[0][1] = get_bits(&s->gb, 4); s->mpeg_f_code[1][0] = get_bits(&s->gb, 4); s->mpeg_f_code[1][1] = get_bits(&s->gb, 4); + s->mpeg_f_code[0][0] += !s->mpeg_f_code[0][0]; + s->mpeg_f_code[0][1] += !s->mpeg_f_code[0][1]; + s->mpeg_f_code[1][0] += !s->mpeg_f_code[1][0]; + s->mpeg_f_code[1][1] += !s->mpeg_f_code[1][1]; if (!s->pict_type && s1->mpeg_enc_ctx_allocated) { av_log(s->avctx, AV_LOG_ERROR, "Missing picture start code\n"); if (s->avctx->err_recognition & AV_EF_EXPLODE) @@ -1553,10 +1557,6 @@ static int mpeg_decode_picture_coding_extension(Mpeg1Context *s1) s->current_picture.f->pict_type = s->pict_type; s->current_picture.f->key_frame = s->pict_type == AV_PICTURE_TYPE_I; } - s->mpeg_f_code[0][0] += !s->mpeg_f_code[0][0]; - s->mpeg_f_code[0][1] += !s->mpeg_f_code[0][1]; - s->mpeg_f_code[1][0] += !s->mpeg_f_code[1][0]; - s->mpeg_f_code[1][1] += !s->mpeg_f_code[1][1]; s->intra_dc_precision = get_bits(&s->gb, 2); s->picture_structure = get_bits(&s->gb, 2); |