adjust scp error return checking for closed channels

Author: JacobBarthelmeh

examples/scpclient/scpclient.c

@@ -324,8 +324,10 @@ THREAD_RETURN WOLFSSH_THREAD scp_client(void* args)
     WCLOSESOCKET(sockFd);
     wolfSSH_free(ssh);
     wolfSSH_CTX_free(ctx);
-    if (ret != WS_SUCCESS && ret != WS_SOCKET_ERROR_E)
+    if (ret != WS_SUCCESS && ret != WS_SOCKET_ERROR_E &&
+            ret != WS_CHANNEL_CLOSED) {
         err_sys("Closing scp stream failed. Connection could have been closed by peer");
+    }
 
     ClientFreeBuffers(pubKeyName, privKeyName, NULL);
 #if !defined(WOLFSSH_NO_ECC) && defined(FP_ECC) && defined(HAVE_THREAD_LS)

src/wolfscp.c

@@ -730,7 +730,11 @@ int DoScpRequest(WOLFSSH* ssh)
         /* Peer MUST send back a SSH_MSG_CHANNEL_CLOSE unless already
             sent*/
         ret = wolfSSH_stream_read(ssh, buf, 1);
-        if (ret != WS_EOF) {
+        if (ret == WS_SOCKET_ERROR_E || ret == WS_CHANNEL_CLOSED) {
+            WLOG(WS_LOG_DEBUG, scpState, "Peer hung up, but SCP is done");
+            ret = WS_SUCCESS;
+        }
+        else if (ret != WS_EOF) {
             WLOG(WS_LOG_DEBUG, scpState, "Did not receive EOF packet");
         }
         else {