Fix bug in copy_email() which would not
find emailAddress at start of subject name.

CHANGES

@@ -3,6 +3,10 @@
 
  Changes between 0.9.6 and 0.9.7  [xx XXX 2000]
 
+  *) In copy_email() check for >= 0 as a return value for
+     X509_NAME_get_index_by_NID() since 0 is a valid index.
+     [Steve Henson reported by Massimiliano Pala <madwolf@opensca.org>]
+
   *) In BN_div() keep a copy of the sign of 'num' before writing the
      result to 'rm' because if rm==num the value will be overwritten
      and produce the wrong result if 'num' is negative: this caused

crypto/x509v3/v3_alt.c

@@ -318,7 +318,7 @@ static int copy_email(X509V3_CTX *ctx, GENERAL_NAMES *gens)
 	/* Now add any email address(es) to STACK */
 	i = -1;
 	while((i = X509_NAME_get_index_by_NID(nm,
-					 NID_pkcs9_emailAddress, i)) > 0) {
+					 NID_pkcs9_emailAddress, i)) >= 0) {
 		ne = X509_NAME_get_entry(nm, i);
 		email = M_ASN1_IA5STRING_dup(X509_NAME_ENTRY_get_data(ne));
 		if(!email || !(gen = GENERAL_NAME_new())) {