Add checks for memory errors in channel functions.

git-svn-id: svn+ssh://svn.berlios.de/svnroot/repos/libssh/trunk@314 7dcaeef0-15fb-0310-b436-a5af3365683c

libssh/channels.c

@@ -48,6 +48,10 @@
  */
 CHANNEL *channel_new(SSH_SESSION *session){
     CHANNEL *channel=malloc(sizeof(CHANNEL));
+
+    if (channel == NULL) {
+      return NULL;
+    }
     memset(channel,0,sizeof(CHANNEL));
     channel->session=session;
     channel->version=session->version;
@@ -1107,9 +1111,21 @@ int channel_select(CHANNEL **readchans, CHANNEL **writechans, CHANNEL **exceptch
         return 0;
     }
     /* prepare the outgoing temporary arrays */
-    rchans=malloc(sizeof(CHANNEL *) * (count_ptrs(readchans)+1));
+    rchans = malloc(sizeof(CHANNEL *) * (count_ptrs(readchans) + 1));
-    wchans=malloc(sizeof(CHANNEL *) * (count_ptrs(writechans)+1));
+    if (rchans == NULL) {
-    echans=malloc(sizeof(CHANNEL *) * (count_ptrs(exceptchans)+1));
+      return SSH_ERROR;
+    }
+    wchans = malloc(sizeof(CHANNEL *) * (count_ptrs(writechans) + 1));
+    if (wchans == NULL) {
+      SAFE_FREE(rchans);
+      return SSH_ERROR;
+    }
+    echans = malloc(sizeof(CHANNEL *) * (count_ptrs(exceptchans) + 1));
+    if (echans == NULL) {
+      SAFE_FREE(rchans);
+      SAFE_FREE(wchans);
+      return SSH_ERROR;
+    }
 
     /* first, try without doing network stuff */
     /* then, select and redo the networkless stuff */

libssh/messages.c

@@ -215,6 +215,10 @@ CHANNEL *ssh_message_channel_request_open_reply_accept(SSH_MESSAGE *msg){
 
     enter_function();
     chan=channel_new(session);
+    if (chan == NULL) {
+      leave_function();
+      return NULL;
+    }
     chan->local_channel=ssh_channel_new_id(session);
     chan->local_maxpacket=35000;
     chan->local_window=32000;

libssh/sftp.c

@@ -49,6 +49,11 @@ SFTP_SESSION *sftp_new(SSH_SESSION *session){
     memset(sftp,0,sizeof(SFTP_SESSION));
     sftp->session=session;
     sftp->channel=channel_new(session);
+    if (sftp->channel == NULL) {
+      SAFE_FREE(sftp);
+      leave_function();
+      return NULL;
+    }
     if(channel_open_session(sftp->channel)){
         channel_free(sftp->channel);
         free(sftp);