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avcodec/wavpack: Fix undefined integer negation

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Fixes: runtime error: negation of -2147483648 cannot be represented in type 'int'; cast to an unsigned type to negate this value to itself
Fixes: 2291/clusterfuzz-testcase-minimized-5538453481586688

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 2017-06-19 14:08:58 +02:00
parent cf7edbd6c5
commit 5f89747086
1 changed files with 2 additions and 2 deletions
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4
libavcodec/wavpack.c
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@ -313,8 +313,8 @@ static float wv_get_value_float(WavpackFrameContext *s, uint32_t *crc, int S)
S *= 1U << s->float_shift;
sign = S < 0;
if (sign)
S = -S;
if (S >= 0x1000000) {
S = -(unsigned)S;
if (S >= 0x1000000U) {
if (s->got_extra_bits && get_bits1(&s->gb_extra_bits))
S = get_bits(&s->gb_extra_bits, 23);
else