ftrace: Fix memory leak on failure path in ftrace_allocate_pages()

As struct ftrace_page is managed in a single linked list, it should
free from the start page.

Link: http://lkml.kernel.org/p/1402474014-28655-1-git-send-email-namhyung@kernel.org

Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>

1 files changed, 2 insertions, 1 deletions

diff --git a/kernel/trace/ftrace.c b/kernel/trace/ftrace.c
index 39df3192e725..e14ff4c1713e 100644
--- a/kernel/trace/ftrace.c
+++ b/kernel/trace/ftrace.c
@@ -2637,7 +2637,8 @@ ftrace_allocate_pages(unsigned long num_to_init)
         return start_pg;
 
  free_pages:
-        while (start_pg) {
+        pg = start_pg;
+        while (pg) {
                 order = get_count_order(pg->size / ENTRIES_PER_PAGE);
                 free_pages((unsigned long)pg->records, order);
                 start_pg = pg->next;