mm: nommu: check the vma list when unmapping file-mapped vma
Now we have the sorted vma list, use it in do_munmap() to check that we
have an exact match.
Signed-off-by: Namhyung Kim <namhyung@gmail.com>
Acked-by: Greg Ungerer <gerg@uclinux.org>
Cc: David Howells <dhowells@redhat.com>
Cc: Paul Mundt <lethal@linux-sh.org>
Cc: Geert Uytterhoeven <geert@linux-m68k.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/mm/nommu.c b/mm/nommu.c
index e5318f8..0563fd9 100644
--- a/mm/nommu.c
+++ b/mm/nommu.c
@@ -1635,7 +1635,6 @@
int do_munmap(struct mm_struct *mm, unsigned long start, size_t len)
{
struct vm_area_struct *vma;
- struct rb_node *rb;
unsigned long end = start + len;
int ret;
@@ -1668,9 +1667,8 @@
}
if (end == vma->vm_end)
goto erase_whole_vma;
- rb = rb_next(&vma->vm_rb);
- vma = rb_entry(rb, struct vm_area_struct, vm_rb);
- } while (rb);
+ vma = vma->vm_next;
+ } while (vma);
kleave(" = -EINVAL [split file]");
return -EINVAL;
} else {