tracing: Fix double free when function profile init failed

commit 83e03b3fe4daffdebbb42151d5410d730ae50bd1 upstream.

On the failure path, stat->start and stat->pages will refer same page.
So it'll attempt to free the same page again and get kernel panic.

Link: http://lkml.kernel.org/r/1364820385-32027-1-git-send-email-namhyung@kernel.org
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Namhyung Kim <namhyung.kim@lge.com>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/kernel/trace/ftrace.c b/kernel/trace/ftrace.c
index e539dfaf65b98511d241a0fde0c365c21e16d475..a3c1dd9fd94e629b8aa6cbb3d430a4782d1877b7 100644 (file)
--- a/kernel/trace/ftrace.c
+++ b/kernel/trace/ftrace.c
@@ -642,7 +642,6 @@ int ftrace_profile_pages_init(struct ftrace_profile_stat *stat)
                free_page(tmp);
        }
 
-       free_page((unsigned long)stat->pages);
        stat->pages = NULL;
        stat->start = NULL;