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Code Issues Releases Activity

wmavoice: validate block alignment

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This prevents a division by zero crash in wmavoice_decode_packet.

The problem was introduced by commit
3deb4b54a24f8cddce463d9f5751b01efeb976af.

Reviewed-by: Ronald S. Bultje <rsbultje@gmail.com>
Signed-off-by: Andreas Cadhalpun <Andreas.Cadhalpun@googlemail.com>
This commit is contained in:
Andreas Cadhalpun 2017-01-01 22:48:38 +01:00
parent 91e6a64d2e
commit e8651f51aa
1 changed files with 5 additions and 0 deletions
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5
libavcodec/wmavoice.c
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@ -388,6 +388,11 @@ static av_cold int wmavoice_decode_init(AVCodecContext *ctx)
ctx->extradata_size);
return AVERROR_INVALIDDATA;
}
if (ctx->block_align <= 0) {
av_log(ctx, AV_LOG_ERROR, "Invalid block alignment %d.\n", ctx->block_align);
return AVERROR_INVALIDDATA;
}
flags = AV_RL32(ctx->extradata + 18);
s->spillover_bitsize = 3 + av_ceil_log2(ctx->block_align);
s->do_apf = flags & 0x1;