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proresdec: Properly make sure an index doesn't run past the limit

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If idx equaled num_coeffs - 1 on entry to the loop, the previous
check failed to break out of the loop.

Reported-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
CC: libav-stable@libav.org
Signed-off-by: Martin Storsjö <martin@martin.st>
This commit is contained in:
Martin Storsjö 2013-09-12 12:10:18 +03:00
parent e90a6846c2
commit ac9d159015
1 changed files with 1 additions and 1 deletions
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2
libavcodec/proresdec.c
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@ -496,7 +496,7 @@ static void unpack_alpha(GetBitContext *gb, uint16_t *dst, int num_coeffs,
dst[idx++] = alpha_val >> 6;
else
dst[idx++] = (alpha_val << 2) | (alpha_val >> 6);
if (idx == num_coeffs - 1)
if (idx >= num_coeffs - 1)
break;
} while (get_bits1(gb));
val = get_bits(gb, 4);