Fix error handling in compute_key, BN_CTX_get can return NULL
@@ -159,6 +159,8 @@ static int compute_key(unsigned char *key, const BIGNUM *pub_key, DH *dh)
goto err;
BN_CTX_start(ctx);
tmp = BN_CTX_get(ctx);
+ if (tmp == NULL)
+ goto err;
if (dh->priv_key == NULL) {
DHerr(DH_F_COMPUTE_KEY, DH_R_NO_PRIVATE_VALUE);
