[S390] memory leak with RCU_TABLE_FREE
The rcu page table free code uses a couple of bits in the page table
pointer passed to tlb_remove_table to discern the different page table
types. __tlb_remove_table extracts the type with an incorrect mask which
leads to memory leaks. The correct mask is ((FRAG_MASK << 4) | FRAG_MASK).
Cc: stable@kernel.org
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
diff --git a/arch/s390/mm/pgtable.c b/arch/s390/mm/pgtable.c
index 5d56c2b..529a088 100644
--- a/arch/s390/mm/pgtable.c
+++ b/arch/s390/mm/pgtable.c
@@ -662,8 +662,9 @@
void __tlb_remove_table(void *_table)
{
- void *table = (void *)((unsigned long) _table & PAGE_MASK);
- unsigned type = (unsigned long) _table & ~PAGE_MASK;
+ const unsigned long mask = (FRAG_MASK << 4) | FRAG_MASK;
+ void *table = (void *)((unsigned long) _table & ~mask);
+ unsigned type = (unsigned long) _table & mask;
if (type)
__page_table_free_rcu(table, type);