Add missing range checks on number of multi primes in rsa_ossl_mod_exp
@@ -604,7 +604,7 @@ static int rsa_ossl_public_decrypt(int flen, const unsigned char *from,
static int rsa_ossl_mod_exp(BIGNUM *r0, const BIGNUM *I, RSA *rsa, BN_CTX *ctx)
{
- BIGNUM *r1, *m1, *vrfy, *r2, *m[RSA_MAX_PRIME_NUM];
+ BIGNUM *r1, *m1, *vrfy, *r2, *m[RSA_MAX_PRIME_NUM - 2];
int ret = 0, i, ex_primes = 0;
RSA_PRIME_INFO *pinfo;
@@ -618,7 +618,8 @@ static int rsa_ossl_mod_exp(BIGNUM *r0, const BIGNUM *I, RSA *rsa, BN_CTX *ctx)
goto err;
if (rsa->version == RSA_ASN1_VERSION_MULTI
- && (ex_primes = sk_RSA_PRIME_INFO_num(rsa->prime_infos)) <= 0)
+ && ((ex_primes = sk_RSA_PRIME_INFO_num(rsa->prime_infos)) <= 0
+ || ex_primes > RSA_MAX_PRIME_NUM - 2))
goto err;
{
