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| author | Michael Niedermayer <michael@niedermayer.cc> | 2018-04-08 03:29:44 +0200 |
|---|---|---|
| committer | Michael Niedermayer <michael@niedermayer.cc> | 2018-04-09 03:09:08 +0200 |
| commit | 249aca8f98ff7fb09c12ea68e23c862c62203b95 (patch) | |
| tree | 22aa4aa818bae1152d80815a988dfbfd38ac52dc | |
| parent | c837918f50a7bbd6150afd340857ea43fe4717c7 (diff) | |
| download | ffmpeg-249aca8f98ff7fb09c12ea68e23c862c62203b95.tar.gz | |
avcodec/movtextdec: Check style_start/end
Limits based on 3GPP TS 26.245 V14.0.0
Fixes: Timeout
Fixes: 6377/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_MOVTEXT_fuzzer-5175929115508736
Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Reviewed-by: Philip Langdale <philipl@overt.org>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
| -rw-r--r-- | libavcodec/movtextdec.c | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/libavcodec/movtextdec.c b/libavcodec/movtextdec.c index 89ac791602..c38c5edce6 100644 --- a/libavcodec/movtextdec.c +++ b/libavcodec/movtextdec.c @@ -299,6 +299,14 @@ static int decode_styl(const uint8_t *tsmb, MovTextContext *m, AVPacket *avpkt) m->s_temp->style_start = AV_RB16(tsmb); tsmb += 2; m->s_temp->style_end = AV_RB16(tsmb); + + if ( m->s_temp->style_end < m->s_temp->style_start + || (m->count_s && m->s_temp->style_start < m->s[m->count_s - 1]->style_end)) { + av_freep(&m->s_temp); + mov_text_cleanup(m); + return AVERROR(ENOMEM); + } + tsmb += 2; m->s_temp->style_fontID = AV_RB16(tsmb); tsmb += 2; |