path: root/arch/s390/mm
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authorMartin Schwidefsky <schwidefsky@de.ibm.com>2011-10-30 15:16:08 +0100
committerMartin Schwidefsky <schwidefsky@de.ibm.com>2011-10-30 15:16:15 +0100
commite73b7fffe487c315fd1a4fa22282e3362b440a06 (patch)
treea6e2e205054d042e2512aba0f54d610233b94001 /arch/s390/mm
parenta45aff5285871bf7be1781d9462d3fdbb6c913f9 (diff)
[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>
Diffstat (limited to 'arch/s390/mm')
1 files changed, 3 insertions, 2 deletions
diff --git a/arch/s390/mm/pgtable.c b/arch/s390/mm/pgtable.c
index 5d56c2b95b14..529a08838376 100644
--- a/arch/s390/mm/pgtable.c
+++ b/arch/s390/mm/pgtable.c
@@ -662,8 +662,9 @@ void page_table_free_rcu(struct mmu_gather *tlb, unsigned long *table)
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);