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avcodec/qdm2: error out of qdm2_fft_decode_tones() before entering endless loop

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Fixes: signed integer overflow: 2147483646 + 2 cannot be represented in type 'int'
Fixes: infinite loop
Fixes: 15396/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_QDM2_fuzzer-5116605501014016

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 694be24bd6c4cc9c62222f4583260bf79056e4c1)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2019-06-24 01:01:03 +02:00
parent 32902cc988
commit a85e0a0b8d
1 changed files with 4 additions and 0 deletions
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4
libavcodec/qdm2.c
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@ -1289,6 +1289,10 @@ static void qdm2_fft_decode_tones(QDM2Context *q, int duration,
}
offset += (n - 2);
} else {
if (local_int_10 <= 2) {
av_log(NULL, AV_LOG_ERROR, "qdm2_fft_decode_tones() stuck\n");
return;
}
offset += qdm2_get_vlc(gb, &vlc_tab_fft_tone_offset[local_int_8], 1, 2);
while (offset >= (local_int_10 - 1)) {
offset += (1 - (local_int_10 - 1));