[Xen-devel] [PATCH][TOOLS] Fix xenconsoled SEGV if domain is destroyed while connected.

[Jimi Xenidis <jimix@xxxxxxxxxxxxxx>]

The following patch fixes a bug where xenconsoled will can SEGV
because it uses FD_ISSET(-1,xxx).  Since the code is written that any
ring/tty handler can set d->tty_fd to -1 it has to be checked
_every_time_.

Signed-off-by: Jimi Xenidis <jimix@xxxxxxxxxxxxxx>


diff -r 00c47d5766100994d1b936873629256874a8d5ba -r 
d2087a16bc5153d6abc4d28b3bcc39904a6c65b6 tools/console/daemon/io.c
--- a/tools/console/daemon/io.c Wed Aug 23 05:49:29 2006 -0400
+++ b/tools/console/daemon/io.c Thu Aug 24 13:42:05 2006 -0400
@@ -584,16 +584,14 @@ void handle_io(void)
                            FD_ISSET(xc_evtchn_fd(d->xce_handle), &readfds))
                                handle_ring_read(d);
 
-                       if (d->tty_fd != -1) {
-                               if (FD_ISSET(d->tty_fd, &readfds))
-                                       handle_tty_read(d);
-
-                               if (FD_ISSET(d->tty_fd, &writefds))
-                                       handle_tty_write(d);
-
-                               if (d->is_dead)
-                                       cleanup_domain(d);
-                       }
+                       if (d->tty_fd != -1 && FD_ISSET(d->tty_fd, &readfds))
+                               handle_tty_read(d);
+
+                       if (d->tty_fd != -1 && FD_ISSET(d->tty_fd, &writefds))
+                               handle_tty_write(d);
+
+                       if (d->is_dead)
+                               cleanup_domain(d);
                }
        } while (ret > -1);
 }


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