linked list - In C why does my clearList function not work -

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i'm trying clear list. keep getting error says free() called on unallocated pointer current. i'm not sure problem have seen multiple sites use code.

this whole program upon request: suppose fill in these 3 functions. 

#include "orderedlist.h"  node *orderedinsert(node *p, int newval) /* allocates new node data value newval    , inserts ordered list    first node pointer p in such way  data values in modified list in  nondecreasing order list traversed.  */  { node * q = null; q = (node*)malloc(sizeof(node)); q->data = newval; q->next = null;  if (q == null) {     return q; }  if (p == null || newval <= p->data ) {     q->next = p->next;     return q; }  node *tmp, *last; tmp = (node*)malloc(sizeof(node));    tmp = p;  while (tmp->next != null && tmp->data <= newval)  {     last = tmp;     tmp = tmp->next; } q->next = tmp; last->next = q; return p; }  void printlist(file *outfile, node *p)  /* prints data values in list     first node pointer p first last,    space between successive values.    prints newline @ end of list. */  {     node* temp = p;     while(temp != null)     {        printf("%d ", temp->data);        temp = temp->next;     }     printf("\n");    }  void clearlist(node **p) /* deletes nodes in list     first node pointer *p, resulting in *p   having value null.  note passing    pointer address can modify     pointer. */ {     node* current = *p;     node* temp;     while(current != null)     {         temp = current->next;         free(current);         current = temp;     }     *p = null; }

sample code

#include <stdio.h> #include <stdlib.h> #include <time.h>  typedef struct node {     int data;     struct node *next; } node;  node *orderedinsert(node *p, int newval){     node *q;     if(null==(q = (node*)malloc(sizeof(node)))){         perror("malloc");         exit(exit_failure);     }     q->data = newval;     q->next = null;      if (p == null || newval <= p->data ){         q->next = p;         return q;     }      node *tmp = p, *last;     while (tmp != null && tmp->data < newval) {         last = tmp;         tmp = tmp->next;     }     q->next = tmp;     last->next = q;     return p; }  void printlist(file *outfile, node *p){     node* temp = p;     while(temp != null){         fprintf(outfile, "%d ", temp->data);         temp = temp->next;     }     fprintf(outfile, "\n"); }  void clearlist(node **p){     node* current = *p;      while(current != null){         node *temp = current->next;         free(current);         current = temp;     }     *p = null; }  int main (void){     node *head = null;     int i, v;      printf("the generated number\n");     for(i=0; i<10; ++i){         v = rand()%10;         printf("%d ", v);         head = orderedinsert(head, v);     }     printf("\n");      printf("the orderd number\n");     printlist(stdout, head);      clearlist(&head);     return 0; }

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