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avformat/mp3dec: fix msan warning when verifying mpa header 

MPEG Audio frame header must be 4 bytes. If we fail to read
4 bytes bail early to avoid Use-of-uninitialized-value msan error.
Reference https://crbug.com/666874.

Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Chris Cunningham 2016-11-22 13:54:50 -08:00 committed by Michael Niedermayer
parent ed412d2850
commit ab87df9a47
1 changed files with 2 additions and 1 deletions
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3
libavformat/mp3dec.c
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@ -457,7 +457,8 @@ static int check(AVIOContext *pb, int64_t pos, uint32_t *ret_header)
return CHECK_SEEK_FAILED;
ret = avio_read(pb, &header_buf[0], 4);
if (ret < 0)
/* We should always find four bytes for a valid mpa header. */
if (ret < 4)
return CHECK_SEEK_FAILED;
header = AV_RB32(&header_buf[0]);