Re: [PATCH] Fix PR remote/15974

[Yao Qi <yao@codesourcery.com>]

On 11/30/2013 04:57 PM, Pedro Alves wrote:
> Instead of setting and unsetting NC at each iteration, the "canonical" way
> for this sort of thing is to check whether the loop ended:
> 
> -  if (nc == NULL)
> +  for (i == ARRAY_SIZE (notifs))
> 
> And then again, we don't really need NC in the loop.  I think
> this would look cleaner and clearer:

OK, you've fixed that bug :).  Pushed it for you.

-- 
Yao (齐尧)

Subject: [PATCH] Fix PR remote/15974

In remote-notif.c:handle_notification, we have a loop,

  for (i = 0; i < ARRAY_SIZE (notifs); i++)
    {
      nc = notifs[i];
      if (strncmp (buf, nc->name, strlen (nc->name)) == 0
	  && buf[strlen (nc->name)] == ':')
	break;
    }

  /* We ignore notifications we don't recognize, for compatibility
     with newer stubs.  */
  if (nc == NULL)
    return;

If the notification is not in the list 'notifs', the last entry is
used, which is wrong.  It should be NULL.  This patch fixes it.

gdb:

2013-12-02  Pedro Alves  <palves@redhat.com>

	PR remote/15974
	* remote-notif.c (handle_notification): Return early if no
	notification is found.
---
 gdb/remote-notif.c |   15 +++++++++------
 1 files changed, 9 insertions(+), 6 deletions(-)

diff --git a/gdb/remote-notif.c b/gdb/remote-notif.c
index 0d59279..163979d 100644
--- a/gdb/remote-notif.c
+++ b/gdb/remote-notif.c
@@ -127,22 +127,25 @@ remote_async_get_pending_events_handler (gdb_client_data data)
 void
 handle_notification (struct remote_notif_state *state, char *buf)
 {
-  struct notif_client *nc = NULL;
-  int i;
+  struct notif_client *nc;
+  size_t i;
 
   for (i = 0; i < ARRAY_SIZE (notifs); i++)
     {
-      nc = notifs[i];
-      if (strncmp (buf, nc->name, strlen (nc->name)) == 0
-	  && buf[strlen (nc->name)] == ':')
+      const char *name = notifs[i]->name;
+
+      if (strncmp (buf, name, strlen (name)) == 0
+	  && buf[strlen (name)] == ':')
 	break;
     }
 
   /* We ignore notifications we don't recognize, for compatibility
      with newer stubs.  */
-  if (nc == NULL)
+  if (i == ARRAY_SIZE (notifs))
     return;
 
+  nc =  notifs[i];
+
   if (state->pending_event[nc->id] != NULL)
     {
       /* We've already parsed the in-flight reply, but the stub for some
-- 
1.7.7.6