[PATCH] mincore: vma crossing fix
My mincore also forgot about crossing vmas.
Signed-off-by: Nick Piggin <npiggin@suse.de>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/mm/mincore.c b/mm/mincore.c
index 9c1d0a4..5efe0de 100644
--- a/mm/mincore.c
+++ b/mm/mincore.c
@@ -77,8 +77,16 @@
* PTE array for our address.
*/
nr = PTRS_PER_PTE - ((addr >> PAGE_SHIFT) & (PTRS_PER_PTE-1));
- if (nr > pages)
- nr = pages;
+
+ /*
+ * Don't overrun this vma
+ */
+ nr = min(nr, (vma->vm_end - addr) >> PAGE_SHIFT);
+
+ /*
+ * Don't return more than the caller asked for
+ */
+ nr = min(nr, pages);
pgd = pgd_offset(vma->vm_mm, addr);
if (pgd_none_or_clear_bad(pgd))