Fixed crashes with DCC chat remove/purge on DCC view (bug #16775)

src/irc/irc-channel.c

@@ -95,6 +95,9 @@ channel_free (t_irc_server *server, t_irc_channel *channel)
 {
     t_irc_channel *new_channels;
     
+    if (!server || !channel)
+        return;
+    
     /* close DCC CHAT */
     if ((t_irc_dcc *)(channel->dcc_chat) &&
         (!DCC_ENDED(((t_irc_dcc *)(channel->dcc_chat))->status)))

src/irc/irc-dcc.c

@@ -345,6 +345,9 @@ dcc_free (t_irc_dcc *ptr_dcc)
 {
     t_irc_dcc *new_dcc_list;
     
+    if (!ptr_dcc)
+        return;
+    
     /* DCC CHAT with channel => remove channel
        (to prevent channel from becoming standard pv) */
     if (ptr_dcc->channel)
@@ -354,7 +357,8 @@ dcc_free (t_irc_dcc *ptr_dcc)
             || (DCC_ENDED(((t_irc_dcc *)(ptr_dcc->channel->dcc_chat))->status)))
         {
             gui_buffer_free (ptr_dcc->channel->buffer, 1);
-            channel_free (ptr_dcc->server, ptr_dcc->channel);
+            if (ptr_dcc->channel)
+                channel_free (ptr_dcc->server, ptr_dcc->channel);
         }
     }
 

src/irc/irc-nick.c

@@ -267,7 +267,10 @@ void
 nick_free (t_irc_channel *channel, t_irc_nick *nick)
 {
     t_irc_nick *new_nicks;
-
+    
+    if (!channel || !nick)
+        return;
+    
     /* remove nick from queue */
     if (channel->last_nick == nick)
         channel->last_nick = nick->prev_nick;
@@ -300,6 +303,9 @@ nick_free (t_irc_channel *channel, t_irc_nick *nick)
 void
 nick_free_all (t_irc_channel *channel)
 {
+    if (!channel)
+        return;
+    
     /* remove all nicks for the channel */
     while (channel->nicks)
         nick_free (channel, channel->nicks);

src/irc/irc-server.c

@@ -283,6 +283,9 @@ server_alloc ()
 void
 server_destroy (t_irc_server *server)
 {
+    if (!server)
+        return;
+    
     /* free data */
     if (server->name)
         free (server->name);
@@ -333,6 +336,9 @@ server_free (t_irc_server *server)
 {
     t_irc_server *new_irc_servers;
 
+    if (!server)
+        return;
+    
     /* close any opened channel/private */
     while (server->channels)
         channel_free (server, server->channels);