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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: #1106
This commit is contained in:
Kurt Roeckx 2016-05-21 16:32:15 +02:00
parent 169a8e391e
commit acc600928d
1 changed files with 5 additions and 1 deletions
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6
crypto/bn/bn_div.c
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@ -278,6 +278,9 @@ int BN_div(BIGNUM *dv, BIGNUM *rm, const BIGNUM *num, const BIGNUM *divisor,
res->top--;
}
/* Increase the resp pointer so that we never create an invalid pointer. */
resp++;
/*
* if res->top == 0 then clear the neg value otherwise decrease the resp
* pointer
@ -287,7 +290,7 @@ int BN_div(BIGNUM *dv, BIGNUM *rm, const BIGNUM *num, const BIGNUM *divisor,
else
resp--;
for (i = 0; i < loop - 1; i++, wnump--, resp--) {
for (i = 0; i < loop - 1; i++, wnump--) {
BN_ULONG q, l0;
/*
* the first part of the loop uses the top two words of snum and sdiv
@ -393,6 +396,7 @@ int BN_div(BIGNUM *dv, BIGNUM *rm, const BIGNUM *num, const BIGNUM *divisor,
(*wnump)++;
}
/* store part of the result */
resp--;
*resp = q;
}
bn_correct_top(snum);