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avcodec/wmaprodec: Fix integer overflow in sfb_offsets initialization

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Fixes out of array read
Fixes: asan_heap-oob_2aec5b0_1828_classical_22_16_2_16000_v3c_0_exclusive_0_29.wma
Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
(cherry picked from commit 5dcb99033d)

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer 2014-11-10 23:07:50 +01:00
parent 11dfd1fa20
commit cfda2a677c
1 changed files with 3 additions and 0 deletions
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3
libavcodec/wmaprodec.c
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@ -422,6 +422,9 @@ static av_cold int decode_init(AVCodecContext *avctx)
offset &= ~3;
if (offset > s->sfb_offsets[i][band - 1])
s->sfb_offsets[i][band++] = offset;
if (offset >= subframe_len)
break;
}
s->sfb_offsets[i][band - 1] = subframe_len;
s->num_sfb[i] = band - 1;