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apedec: check bits <= 32. 

Fixes a floating-point exception further down.

Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
CC: libav-stable@libav.org
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
Signed-off-by: Ronald S. Bultje <rsbultje@gmail.com>
Signed-off-by: Derek Buitenhuis <derek.buitenhuis@gmail.com>
This commit is contained in:
Michael Niedermayer 2012-03-29 17:52:21 +00:00 committed by Derek Buitenhuis
parent c265b77b11
commit 420d1df2e2
1 changed files with 4 additions and 1 deletions
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5
libavcodec/apedec.c
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@ -421,9 +421,12 @@ static inline int ape_decode_value(APEContext *ctx, APERice *rice)
if (tmpk <= 16)
x = range_decode_bits(ctx, tmpk);
else {
else if (tmpk <= 32) {
x = range_decode_bits(ctx, 16);
x |= (range_decode_bits(ctx, tmpk - 16) << 16);
} else {
av_log(ctx->avctx, AV_LOG_ERROR, "Too many bits: %d\n", tmpk);
return AVERROR_INVALIDDATA;
}
x += overflow << tmpk;
} else {