From 1878717b75934952741ce1f08e23de0353b34fcb Mon Sep 17 00:00:00 2001
From: Wang Shilong <wangsl.fnst@cn.fujitsu.com>
Date: Wed, 4 Dec 2013 17:24:36 +0800
Subject: [PATCH] Btrfs-progs: fix segfault when getting scrub status

I sometimes get segfault in cmd_scrub_status(), this is because
free_history() forgot to check whether pointer address is valid,fix it.

Signed-off-by: Wang Shilong <wangsl.fnst@cn.fujitsu.com>
Signed-off-by: David Sterba <dsterba@suse.cz>
Signed-off-by: Chris Mason <clm@fb.com>
---
 cmds-scrub.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/cmds-scrub.c b/cmds-scrub.c
index 25d4ef5..31486df 100644
--- a/cmds-scrub.c
+++ b/cmds-scrub.c
@@ -285,7 +285,7 @@ static void print_fs_stat(struct scrub_fs_stat *fs_stat, int raw)
 static void free_history(struct scrub_file_record **last_scrubs)
 {
 	struct scrub_file_record **l = last_scrubs;
-	if (!l)
+	if (!l || IS_ERR(l))
 		return;
 	while (*l)
 		free(*l++);
-- 
2.7.4