* infrun.c (resume): If following a fork, reread the current

	thread.  Avoid dereferencing a possibly dangling pointer.

2 files changed, 11 insertions, 2 deletions

diff --git a/gdb/ChangeLog b/gdb/ChangeLog
index 4eabe76..62b98fe 100644
--- a/gdb/ChangeLog
+++ b/gdb/ChangeLog
@@ -1,3 +1,8 @@
+2008-11-20  Pedro Alves  <pedro@codesourcery.com>
+
+	* infrun.c (resume): If following a fork, reread the current
+	thread.  Avoid dereferencing a possibly dangling pointer.
+
 2008-11-19  Doug Evans  <dje@google.com>
 
 	* inferior.h (proceed_to_finish): Delete, unused.
diff --git a/gdb/infrun.c b/gdb/infrun.c
index f218fa0..93ee00b 100644
--- a/gdb/infrun.c
+++ b/gdb/infrun.c
@@ -1053,6 +1053,10 @@ a command like `return' or `jump' to continue execution."));
       pending_follow.kind = TARGET_WAITKIND_SPURIOUS;
       if (follow_fork ())
 	should_resume = 0;
+
+      /* Following a child fork will change our notion of current
+	 thread.  */
+      tp = inferior_thread ();
       break;
 
     case TARGET_WAITKIND_EXECD:
@@ -1148,11 +1152,11 @@ a command like `return' or `jump' to continue execution."));
           displaced_step_dump_bytes (gdb_stdlog, buf, sizeof (buf));
         }
 
-      target_resume (resume_ptid, step, sig);
-
       /* Avoid confusing the next resume, if the next stop/resume
 	 happens to apply to another thread.  */
       tp->stop_signal = TARGET_SIGNAL_0;
+
+      target_resume (resume_ptid, step, sig);
     }
 
   discard_cleanups (old_cleanups);