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Avoid creating an illegal pointer

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Found by tis-interpreter

Reviewed-by: Rich Salz <rsalz@openssl.org>

GH: #1122
This commit is contained in:
Kurt Roeckx 2016-05-24 21:32:01 +02:00
parent 223516eadc
commit dc9887c019
1 changed files with 4 additions and 4 deletions
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8
crypto/asn1/a_int.c
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@ -201,18 +201,18 @@ static size_t c2i_ibuf(unsigned char *b, int *pneg,
/* Must be negative: calculate twos complement */
if (b) {
const unsigned char *from = p + plen - 1 + pad;
unsigned char *to = b + plen - 1;
unsigned char *to = b + plen;
i = plen;
while (*from == 0 && i) {
*to-- = 0;
*--to = 0;
i--;
from--;
}
*to-- = (*from-- ^ 0xff) + 1;
*--to = (*from-- ^ 0xff) + 1;
OPENSSL_assert(i != 0);
i--;
for (; i > 0; i--)
*to-- = *from-- ^ 0xff;
*--to = *from-- ^ 0xff;
}
return plen;
}