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avcodec/hevc_sei: Fix integer overflows in decode_nal_sei_message()

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Fixes: signed integer overflow: 2147483520 + 255 cannot be represented in type 'int'
Fixes: 4554/clusterfuzz-testcase-minimized-4843714515042304

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2017-12-15 17:50:12 +01:00
parent 439fbb9c8b
commit 991ef6e5b9
1 changed files with 4 additions and 0 deletions
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4
libavcodec/hevc_sei.c
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@ -324,11 +324,15 @@ static int decode_nal_sei_message(GetBitContext *gb, void *logctx, HEVCSEI *s,
av_log(logctx, AV_LOG_DEBUG, "Decoding SEI\n");
while (byte == 0xFF) {
if (get_bits_left(gb) < 16 || payload_type > INT_MAX - 255)
return AVERROR_INVALIDDATA;
byte = get_bits(gb, 8);
payload_type += byte;
}
byte = 0xFF;
while (byte == 0xFF) {
if (get_bits_left(gb) < 8 + 8LL*payload_size)
return AVERROR_INVALIDDATA;
byte = get_bits(gb, 8);
payload_size += byte;
}