[ 04/11] tracing: Fix double free when function profile init failed

From: Greg Kroah-Hartman
Date: Sun Apr 14 2013 - 22:20:14 EST


3.0-stable review patch. If anyone has any objections, please let me know.

------------------

From: Namhyung Kim <namhyung.kim@xxxxxxx>

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@xxxxxxxxxx

Signed-off-by: Namhyung Kim <namhyung@xxxxxxxxxx>
Cc: Frederic Weisbecker <fweisbec@xxxxxxxxx>
Cc: Namhyung Kim <namhyung.kim@xxxxxxx>
Signed-off-by: Steven Rostedt <rostedt@xxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
kernel/trace/ftrace.c | 1 -
1 file changed, 1 deletion(-)

--- a/kernel/trace/ftrace.c
+++ b/kernel/trace/ftrace.c
@@ -566,7 +566,6 @@ int ftrace_profile_pages_init(struct ftr
free_page(tmp);
}

- free_page((unsigned long)stat->pages);
stat->pages = NULL;
stat->start = NULL;



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