Commit dc9887c0 authored by Kurt Roeckx's avatar Kurt Roeckx
Browse files

Avoid creating an illegal pointer 



Found by tis-interpreter

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

GH: #1122
parent 223516ea

crypto/asn1/a_int.c

+4 −4
Original line number Diff line number Diff line
@@ -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;

}