3.2-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Heiko Carstens <redacted>

commit d55c4c613fc4d4ad2ba0fc6fa2b57176d420f7e4 upstream.

When walking page tables we need to make sure that everything
is within bounds of the ASCE limit of the task's address space.
Otherwise we might calculate e.g. a pud pointer which is not
within a pud and dereference it.
So check against TASK_SIZE (which is the ASCE limit) before
walking page tables.

Reviewed-by: Gerald Schaefer <redacted>
Signed-off-by: Heiko Carstens <redacted>
Signed-off-by: Martin Schwidefsky <redacted>
Signed-off-by: Ben Hutchings <redacted>
---
 arch/s390/mm/gup.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/s390/mm/gup.c b/arch/s390/mm/gup.c
index 8b82853..16fb3c1 100644
--- a/arch/s390/mm/gup.c
+++ b/arch/s390/mm/gup.c

@@ -229,7 +229,7 @@ int get_user_pages_fast(unsigned long start, int nr_pages, int write,
 	addr = start;
 	len = (unsigned long) nr_pages << PAGE_SHIFT;
 	end = start + len;
-	if (end < start)
+	if ((end < start) || (end > TASK_SIZE))
 		goto slow_irqon;
 
 	/*