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authorswkhack <swkhack@gmail.com>2019-06-13 15:56:08 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2019-06-13 17:34:56 -1000
commit0874bb49bb21bf24deda853e8bf61b8325e24bcb (patch)
tree965fb2ebfe60c6dd4541724ea29c74424e4bede9 /mm
parent7a30df49f63ad92318ddf1f7498d1129a77dd4bd (diff)
downloadstable-0874bb49bb21bf24deda853e8bf61b8325e24bcb.tar.gz
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mm/mlock.c: change count_mm_mlocked_page_nr return type
On a 64-bit machine the value of "vma->vm_end - vma->vm_start" may be negative when using 32 bit ints and the "count >> PAGE_SHIFT"'s result will be wrong. So change the local variable and return value to unsigned long to fix the problem. Link: http://lkml.kernel.org/r/20190513023701.83056-1-swkhack@gmail.com Fixes: 0cf2f6f6dc60 ("mm: mlock: check against vma for actual mlock() size") Signed-off-by: swkhack <swkhack@gmail.com> Acked-by: Michal Hocko <mhocko@suse.com> Reviewed-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm')
-rw-r--r--mm/mlock.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/mm/mlock.c b/mm/mlock.c
index cef65bf3964c..a90099da4fb4 100644
--- a/mm/mlock.c
+++ b/mm/mlock.c
@@ -636,11 +636,11 @@ static int apply_vma_lock_flags(unsigned long start, size_t len,
* is also counted.
* Return value: previously mlocked page counts
*/
-static int count_mm_mlocked_page_nr(struct mm_struct *mm,
+static unsigned long count_mm_mlocked_page_nr(struct mm_struct *mm,
unsigned long start, size_t len)
{
struct vm_area_struct *vma;
- int count = 0;
+ unsigned long count = 0;
if (mm == NULL)
mm = current->mm;