[PATCH] x86/pat: fix memory leak in free_memtype

[Xiaotian Feng]

reserve_memtype will allocate memory for new memtype, but
in free_memtype, after the memtype erased from rbtree, the
memory is not freed.

Signed-off-by: Xiaotian Feng <dfeng@xxxxxxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxxxxx>
Cc: "H. Peter Anvin" <hpa@xxxxxxxxx>
Cc: Venkatesh Pallipadi <venkatesh.pallipadi@xxxxxxxxx>
Cc: Jack Steiner <steiner@xxxxxxx>
Cc: Suresh Siddha <suresh.b.siddha@xxxxxxxxx>
---
 arch/x86/mm/pat_rbtree.c |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)

diff --git a/arch/x86/mm/pat_rbtree.c b/arch/x86/mm/pat_rbtree.c
index 07de4cb..fb8c1e5 100644
--- a/arch/x86/mm/pat_rbtree.c
+++ b/arch/x86/mm/pat_rbtree.c
@@ -15,6 +15,7 @@
 #include <linux/rbtree.h>
 #include <linux/sched.h>
 #include <linux/gfp.h>
+#include <linux/slab.h>
 
 #include <asm/pgtable.h>
 #include <asm/pat.h>
@@ -240,6 +241,7 @@ int rbt_memtype_erase(u64 start, u64 end)
 		return -EINVAL;
 
 	rb_erase(&data->rb, &memtype_rbroot);
+	kfree(data);
 	return 0;
 }
 
-- 
1.7.0.1

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