[FFmpeg-cvslog] avcodec/bitstream: Check for integer code truncation in build_table()
Michael Niedermayer
git at videolan.org
Fri Jun 14 22:40:10 EEST 2019
ffmpeg | branch: master | Michael Niedermayer <michael at niedermayer.cc> | Wed Jun 5 12:18:54 2019 +0200| [e78b0f83748f92ea9e93b21c36082e0dd04d7cb1] | committer: Michael Niedermayer
avcodec/bitstream: Check for integer code truncation in build_table()
Fixes: out of array read
Fixes: 14563/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_AGM_fuzzer-5646451545210880
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=e78b0f83748f92ea9e93b21c36082e0dd04d7cb1
---
libavcodec/bitstream.c | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/libavcodec/bitstream.c b/libavcodec/bitstream.c
index 8762e5f4b2..590b490527 100644
--- a/libavcodec/bitstream.c
+++ b/libavcodec/bitstream.c
@@ -226,6 +226,10 @@ static int build_table(VLC *vlc, int table_nb_bits, int nb_codes,
/* note: realloc has been done, so reload tables */
table = (volatile VLC_TYPE (*)[2])&vlc->table[table_index];
table[j][0] = index; //code
+ if (table[j][0] != index) {
+ avpriv_request_sample(NULL, "strange codes");
+ return AVERROR_PATCHWELCOME;
+ }
i = k-1;
}
}
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