From: Oleg Nesterov <oleg@tv-sign.ru>

get_user_pages() must not return the error when i != 0.  When pages !=
NULL we have i get_page()'ed pages.

Signed-off-by: Oleg Nesterov <oleg@tv-sign.ru>
Acked-by: Nick Piggin <npiggin@suse.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 mm/memory.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff -puN mm/memory.c~get_user_pages-fix-possible-page-leak-on-oom mm/memory.c
--- a/mm/memory.c~get_user_pages-fix-possible-page-leak-on-oom
+++ a/mm/memory.c
@@ -1151,7 +1151,7 @@ int get_user_pages(struct task_struct *t
 			 * be processed until returning to user space.
 			 */
 			if (unlikely(test_tsk_thread_flag(tsk, TIF_MEMDIE)))
-				return -ENOMEM;
+				return i ? i : -ENOMEM;
 
 			if (write)
 				foll_flags |= FOLL_WRITE;
_