Fix bugs found by clang

src/auth.c

@@ -966,6 +966,10 @@ int ssh_userauth_agent(ssh_session session,
     }
     if (!session->agent_state){
         session->agent_state = malloc(sizeof(struct ssh_agent_state_struct));
+        if (!session->agent_state){
+            ssh_set_error_oom(session);
+            return SSH_AUTH_ERROR;
+        }
         ZERO_STRUCTP(session->agent_state);
         session->agent_state->state=SSH_AGENT_STATE_NONE;
     }

src/channels.c

@@ -1542,7 +1542,7 @@ static int channel_request(ssh_channel channel, const char *request,
   }
 pending:
   rc = ssh_handle_packets_termination(session,SSH_TIMEOUT_USER, ssh_channel_request_termination, channel);
-  if(session->session_state == SSH_SESSION_STATE_ERROR) {
+  if(session->session_state == SSH_SESSION_STATE_ERROR || rc == SSH_ERROR) {
       channel->request_state = SSH_CHANNEL_REQ_STATE_ERROR;
   }
   /* we received something */

src/ecdh.c

@@ -251,7 +251,8 @@ int ssh_server_ecdh_init(ssh_session session, ssh_buffer packet){
 
     ssh_log(session,SSH_LOG_PROTOCOL, "SSH_MSG_KEXDH_REPLY sent");
     rc = packet_send(session);
-
+    if (rc == SSH_ERROR)
+        goto error;
 
     /* Send the MSG_NEWKEYS */
     if (buffer_add_u8(session->out_buffer, SSH2_MSG_NEWKEYS) < 0) {

src/server.c

@@ -165,6 +165,8 @@ SSH_PACKET_CALLBACK(ssh_packet_kexdh_init){
       default:
         ssh_set_error(session,SSH_FATAL,"Wrong kex type in ssh_packet_kexdh_init");
   }
+  if (rc == SSH_ERROR)
+      session->session_state = SSH_SESSION_STATE_ERROR;
   error:
   leave_function();
   return SSH_PACKET_USED;