[FFmpeg-devel] [PATCH 1/2] avcodec/bitstream: Check for integer code truncation in build_table()
Michael Niedermayer
michael at niedermayer.cc
Wed Jun 5 13:55:16 EEST 2019
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>
---
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;
}
}
--
2.21.0
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