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proresdec: Properly make sure an index doesn't run past the limit
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>
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@ -496,7 +496,7 @@ static void unpack_alpha(GetBitContext *gb, uint16_t *dst, int num_coeffs,
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dst[idx++] = alpha_val >> 6;
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else
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dst[idx++] = (alpha_val << 2) | (alpha_val >> 6);
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if (idx == num_coeffs - 1)
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if (idx >= num_coeffs - 1)
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break;
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} while (get_bits1(gb));
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val = get_bits(gb, 4);
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