diff options
| author | Michel Lespinasse <walken@google.com> | 2013-02-23 01:35:55 +0100 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2013-02-24 02:50:22 +0100 |
| commit | 28a35716d317980ae9bc2ff2f84c33a3cda9e884 (patch) | |
| tree | a69307192d34334c6869cfe33b6fea4e358de718 /mm/mlock.c | |
| parent | mm: accurately document nr_free_*_pages functions with code comments (diff) | |
| download | linux-28a35716d317980ae9bc2ff2f84c33a3cda9e884.tar.xz linux-28a35716d317980ae9bc2ff2f84c33a3cda9e884.zip | |
mm: use long type for page counts in mm_populate() and get_user_pages()
Use long type for page counts in mm_populate() so as to avoid integer
overflow when running the following test code:
int main(void) {
void *p = mmap(NULL, 0x100000000000, PROT_READ,
MAP_PRIVATE | MAP_ANON, -1, 0);
printf("p: %p\n", p);
mlockall(MCL_CURRENT);
printf("done\n");
return 0;
}
Signed-off-by: Michel Lespinasse <walken@google.com>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Cc: Rik van Riel <riel@redhat.com>
Cc: Mel Gorman <mgorman@suse.de>
Cc: Hugh Dickins <hughd@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/mlock.c')
| -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 38db3b094105..e6638f565d42 100644 --- a/mm/mlock.c +++ b/mm/mlock.c @@ -160,7 +160,7 @@ long __mlock_vma_pages_range(struct vm_area_struct *vma, { struct mm_struct *mm = vma->vm_mm; unsigned long addr = start; - int nr_pages = (end - start) / PAGE_SIZE; + unsigned long nr_pages = (end - start) / PAGE_SIZE; int gup_flags; VM_BUG_ON(start & ~PAGE_MASK); @@ -382,7 +382,7 @@ int __mm_populate(unsigned long start, unsigned long len, int ignore_errors) unsigned long end, nstart, nend; struct vm_area_struct *vma = NULL; int locked = 0; - int ret = 0; + long ret = 0; VM_BUG_ON(start & ~PAGE_MASK); VM_BUG_ON(len != PAGE_ALIGN(len)); |