[RFA] gdbserver with reversed arguments seg. fault

[Denis PILAT <denis dot pilat at st dot com>]

Hi,

Following our discussion in the thread 
http://sources.redhat.com/ml/gdb-patches/2007-01/msg00059.html
I'm proposing the attached patch to fix a segmentation fault that occurs 
into gdbserver when you revert the binary filename with the "host:port" 
argument.
In inferiors.c the inferior_target_data() function is called with a NULL 
pointer argument. At the beginning I though of testing arguments but 
none of them are tested in this whole file so I concluded it's up to the 
caller to do so.

(I hope this time my patch is related to a version nearer from the HEAD :)
Denis
--

2007-01-03  Denis Pilat  <denis.pilat@st.com>

   * linux-low.c (linux_kill): handle the null case of all_threads.head.

Index: linux-low.c
===================================================================
--- linux-low.c (revision 545)
+++ linux-low.c (working copy)
@@ -255,9 +255,13 @@ static void
linux_kill (void)
{
  struct thread_info *thread = (struct thread_info *) all_threads.head;
-  struct process_info *process = get_thread_process (thread);
+  struct process_info *process;
  int wstat;

+  if (! thread)
+     return;
+
+  process = get_thread_process (thread);
  for_each_inferior (&all_threads, linux_kill_one_process);

  /* See the comment in linux_kill_one_process.  We did not kill the first