Merge branch 'pm-sleep'

* pm-sleep:
  PM / hibernate: Avoid overflow in hibernate_preallocate_memory()

1 files changed, 5 insertions, 1 deletions

diff --git a/kernel/power/snapshot.c b/kernel/power/snapshot.c
index 98c3b34a4cff..10c22cae83a0 100644
--- a/kernel/power/snapshot.c
+++ b/kernel/power/snapshot.c
@@ -1402,7 +1402,11 @@ int hibernate_preallocate_memory(void)
          * highmem and non-highmem zones separately.
          */
         pages_highmem = preallocate_image_highmem(highmem / 2);
-        alloc = (count - max_size) - pages_highmem;
+        alloc = count - max_size;
+        if (alloc > pages_highmem)
+                alloc -= pages_highmem;
+        else
+                alloc = 0;
         pages = preallocate_image_memory(alloc, avail_normal);
         if (pages < alloc) {
                 /* We have exhausted non-highmem pages, try highmem. */