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-rw-r--r--arch/s390/mm/gmap.c7
1 files changed, 7 insertions, 0 deletions
diff --git a/arch/s390/mm/gmap.c b/arch/s390/mm/gmap.c
index af03cacf34ec..1ac73917a8d3 100644
--- a/arch/s390/mm/gmap.c
+++ b/arch/s390/mm/gmap.c
@@ -1183,6 +1183,7 @@ EXPORT_SYMBOL_GPL(gmap_read_table);
static inline void gmap_insert_rmap(struct gmap *sg, unsigned long vmaddr,
struct gmap_rmap *rmap)
{
+ struct gmap_rmap *temp;
void __rcu **slot;
BUG_ON(!gmap_is_shadow(sg));
@@ -1190,6 +1191,12 @@ static inline void gmap_insert_rmap(struct gmap *sg, unsigned long vmaddr,
if (slot) {
rmap->next = radix_tree_deref_slot_protected(slot,
&sg->guest_table_lock);
+ for (temp = rmap->next; temp; temp = temp->next) {
+ if (temp->raddr == rmap->raddr) {
+ kfree(rmap);
+ return;
+ }
+ }
radix_tree_replace_slot(&sg->host_to_rmap, slot, rmap);
} else {
rmap->next = NULL;