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*x = malloc (number * sizeof(int));
if (x == NULL) {
  /* Handle Allocation Error */
}
if (error_conditon == 1) {
  /* Handle Error Condition*/
}
/* ... */
free(x);

References

VU#623332 , http://www.kb.cert.org/vuls/id/623332
MIT krb5 Security Advisory 2005-003 http://web.mit.edu/kerberos/www/advisories/MITKRB5-SA-2005-003-recvauth.txt
OWASP Double Free http://www.owasp.org/index.php/Double_Free