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diracdec: Correct the bytestream end pointer.

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This fixes some arith decoder overreads and a potential infinite loop.

Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer 2012-03-06 19:13:55 +01:00
parent f095391a14
commit 0f13cc732b
1 changed files with 1 additions and 1 deletions
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2
libavcodec/diracdec.c
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@ -625,7 +625,7 @@ static void decode_component(DiracContext *s, int comp)
b->quant = svq3_get_ue_golomb(&s->gb);
align_get_bits(&s->gb);
b->coeff_data = s->gb.buffer + get_bits_count(&s->gb)/8;
b->length = FFMIN(b->length, get_bits_left(&s->gb)/8);
b->length = FFMIN(b->length, FFMAX(get_bits_left(&s->gb)/8, 0));
skip_bits_long(&s->gb, b->length*8);
}
}