Allow NULL for free_public_key.

g10/ChangeLog

@@ -1,3 +1,14 @@
+2011-09-20  Werner Koch  <wk@g10code.com>
+
+	* free-packet.c (free_public_key): Allow a NULL argument.
+	* keyedit.c (keyedit_passwd): No more need to check that PK is NULL.
+	(menu_addrevoker): Ditto.
+	* passphrase.c (passphrase_get, passphrase_to_dek_ext): Ditto.
+	* skclist.c (release_sk_list): Ditto.
+	* revoke.c (gen_desig_revoke): Ditto.
+	* pubkey-enc.c (get_session_key): Ditto.
+	* pkclist.c (build_pk_list): Ditto.
+
 2011-09-20  Jim Meyering  <meyering@redhat.com>
 
 	avoid use of freed pointer

g10/free-packet.c

@@ -120,11 +120,16 @@ release_public_key_parts (PKT_public_key *pk)
 }
 
 
+/* Free an allocated public key structure including all parts.
+   Passing NULL is allowed.  */
 void
 free_public_key (PKT_public_key *pk)
 {
-  release_public_key_parts (pk);
+  if (pk)
-  xfree(pk);
+    {
+      release_public_key_parts (pk);
+      xfree(pk);
+    }
 }
 
 

g10/keyedit.c

@@ -2253,8 +2253,7 @@ keyedit_passwd (ctrl_t ctrl, const char *username)
 
 leave:
   release_kbnode (keyblock);
-  if (pk)
+  free_public_key (pk);
-    free_public_key (pk);
   if (err)
     {
       log_info ("error changing the passphrase for `%s': %s\n",
@@ -3327,9 +3326,7 @@ menu_addrevoker (ctrl_t ctrl, kbnode_t pub_keyblock, int sensitive)
     {
       char *answer;
 
-      if (revoker_pk)
+      free_public_key (revoker_pk);
-	free_public_key (revoker_pk);
-
       revoker_pk = xmalloc_clear (sizeof (*revoker_pk));
 
       tty_printf ("\n");
@@ -3453,8 +3450,7 @@ menu_addrevoker (ctrl_t ctrl, kbnode_t pub_keyblock, int sensitive)
 fail:
   if (sig)
     free_seckey_enc (sig);
-  if (revoker_pk)
+  free_public_key (revoker_pk);
-    free_public_key (revoker_pk);
 
   return 0;
 }

g10/passphrase.c

@@ -235,8 +235,7 @@ passphrase_get ( u32 *keyid, int mode, const char *cacheid, int repeat,
   memset (fpr, 0, MAX_FINGERPRINT_LEN );
   if( keyid && get_pubkey( pk, keyid ) )
     {
-      if (pk)
+      free_public_key (pk);
-        free_public_key( pk );
       pk = NULL; /* oops: no key for some reason */
     }
 
@@ -344,8 +343,7 @@ passphrase_get ( u32 *keyid, int mode, const char *cacheid, int repeat,
       write_status_errcode ("get_passphrase", rc);
     }
 
-  if (pk)
+  free_public_key (pk);
-    free_public_key( pk );
   if (rc)
     {
       xfree (pw);
@@ -531,8 +529,7 @@ passphrase_to_dek_ext (u32 *keyid, int pubkey_algo,
 	}
 
       tty_printf("\n");
-      if (pk)
+      free_public_key (pk);
-        free_public_key( pk );
     }
 
   if ( next_pw )

g10/pkclist.c

@@ -1064,8 +1064,7 @@ build_pk_list (ctrl_t ctrl,
             continue;
 
           /* Get and check key for the current name. */
-          if (pk)
+          free_public_key (pk);
-            free_public_key (pk);
           pk = xmalloc_clear( sizeof *pk );
           pk->req_usage = use;
           rc = get_pubkey_byname (ctrl, NULL, pk, answer, NULL, NULL, 0, 0 );
@@ -1078,7 +1077,8 @@ build_pk_list (ctrl_t ctrl,
                   /* No validation for a default recipient. */
                   if (!key_present_in_pk_list(pk_list, pk))
                     {
-                      free_public_key (pk); pk = NULL;
+                      free_public_key (pk);
+                      pk = NULL;
                       log_info (_("skipped: public key "
                                   "already set as default recipient\n") );
                     }
@@ -1108,7 +1108,8 @@ build_pk_list (ctrl_t ctrl,
                        * present in the list */
                       if (!key_present_in_pk_list(pk_list, pk))
                         {
-                          free_public_key(pk); pk = NULL;
+                          free_public_key (pk);
+                          pk = NULL;
                           log_info(_("skipped: public key already set\n") );
                         }
                       else

g10/pubkey-enc.c

@@ -97,8 +97,7 @@ get_session_key (PKT_pubkey_enc * k, DEK * dek)
 
       for (;;)
         {
-          if (sk)
+          free_public_key (sk);
-            free_public_key (sk);
           sk = xmalloc_clear (sizeof *sk);
           rc = enum_secret_keys (&enum_context, sk);
           if (rc)
@@ -127,8 +126,7 @@ get_session_key (PKT_pubkey_enc * k, DEK * dek)
     }
 
 leave:
-  if (sk)
+  free_public_key (sk);
-    free_public_key (sk);
   return rc;
 }
 

g10/revoke.c

@@ -262,11 +262,8 @@ gen_desig_revoke( const char *uname, strlist_t locusr )
       {
 	SK_LIST list;
 
-	if (pk2)
+        free_public_key (pk2);
-	  {
+        pk2 = NULL;
-	    free_public_key (pk2);
-	    pk2 = NULL;
-	  }
 
 	if(sk_list)
 	  {
@@ -417,10 +414,8 @@ gen_desig_revoke( const char *uname, strlist_t locusr )
       log_error(_("no revocation keys found for \"%s\"\n"),uname);
 
   leave:
-    if( pk )
+    free_public_key (pk);
-	free_public_key( pk );
+    free_public_key (pk2);
-    if (pk2)
-	free_public_key (pk2);
     if( sig )
 	free_seckey_enc( sig );
 

g10/skclist.c

@@ -51,8 +51,7 @@ release_sk_list (SK_LIST sk_list)
   for (; sk_list; sk_list = sk_rover)
     {
       sk_rover = sk_list->next;
-      if (sk_list->pk)
+      free_public_key (sk_list->pk);
-        free_public_key (sk_list->pk);
       xfree (sk_list);
     }
 }