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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> (cherry picked from commit 4020b009d1e88ff10abd25fb768165afa546851d) Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
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@ -870,6 +870,12 @@ static int wavpack_decode_block(AVCodecContext *avctx, int block_no,
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s->float_flag = bytestream2_get_byte(&gb);
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s->float_shift = bytestream2_get_byte(&gb);
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s->float_max_exp = bytestream2_get_byte(&gb);
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if (s->float_shift > 31) {
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av_log(avctx, AV_LOG_ERROR,
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"Invalid FLOATINFO, shift = %d (> 31)\n", s->float_shift);
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s->float_shift = 0;
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continue;
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}
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got_float = 1;
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bytestream2_skip(&gb, 1);
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break;
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