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avcodec/wavpack: Check float_shift 

Fixes: runtime error: shift exponent 40 is too large for 32-bit type 'unsigned int'
Fixes: 1898/clusterfuzz-testcase-minimized-5970744880136192

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 2017-05-30 03:13:21 +02:00
parent d90c5bf105
commit 4020b009d1
1 changed files with 6 additions and 0 deletions
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6
libavcodec/wavpack.c
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@ -887,6 +887,12 @@ static int wavpack_decode_block(AVCodecContext *avctx, int block_no,
s->float_flag = bytestream2_get_byte(&gb);
s->float_shift = bytestream2_get_byte(&gb);
s->float_max_exp = bytestream2_get_byte(&gb);
if (s->float_shift > 31) {
av_log(avctx, AV_LOG_ERROR,
"Invalid FLOATINFO, shift = %d (> 31)\n", s->float_shift);
s->float_shift = 0;
continue;
}
got_float = 1;
bytestream2_skip(&gb, 1);
break;