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-rw-r--r--mm/gup.c5
1 files changed, 4 insertions, 1 deletions
diff --git a/mm/gup.c b/mm/gup.c
index e0d82b6706d7..8fc23a60487d 100644
--- a/mm/gup.c
+++ b/mm/gup.c
@@ -1816,9 +1816,12 @@ int get_user_pages_fast(unsigned long start, int nr_pages, int write,
len = (unsigned long) nr_pages << PAGE_SHIFT;
end = start + len;
+ if (nr_pages <= 0)
+ return 0;
+
if (unlikely(!access_ok(write ? VERIFY_WRITE : VERIFY_READ,
(void __user *)start, len)))
- return 0;
+ return -EFAULT;
if (gup_fast_permitted(start, nr_pages, write)) {
local_irq_disable();