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| author | swkhack <swkhack@gmail.com> | 2019-06-13 15:56:08 -0700 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2019-07-10 09:52:27 +0200 |
| commit | 12006942792bba95db84339ab8cc7a28b525226d (patch) | |
| tree | d76a9aa5e4bb86cd9ffd86ac670f2799a0d0b305 /mm | |
| parent | 80d567f799c18814c2065df840c74d76ded2fc3c (diff) | |
| download | linux-stable-12006942792bba95db84339ab8cc7a28b525226d.tar.gz linux-stable-12006942792bba95db84339ab8cc7a28b525226d.tar.bz2 linux-stable-12006942792bba95db84339ab8cc7a28b525226d.zip | |
mm/mlock.c: change count_mm_mlocked_page_nr return type
[ Upstream commit 0874bb49bb21bf24deda853e8bf61b8325e24bcb ]
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>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'mm')
| -rw-r--r-- | mm/mlock.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/mm/mlock.c b/mm/mlock.c index 080f3b36415b..d614163f569b 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; |