mm: fix error reporting in move_pages() syscall
The vma returned by find_vma does not necessarily include the target
address. If this happens the code tries to follow a page outside of any
vma and returns ENOENT instead of EFAULT.
Signed-off-by: Gleb Natapov <gleb@redhat.com>
Acked-by: Christoph Lameter <cl@linux-foundation.org>
Cc: Minchan Kim <minchan.kim@gmail.com>
Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: Mel Gorman <mel@csn.ul.ie>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/mm/migrate.c b/mm/migrate.c
index 35e4541..fe5a3c6 100644
--- a/mm/migrate.c
+++ b/mm/migrate.c
@@ -1037,7 +1037,7 @@
err = -EFAULT;
vma = find_vma(mm, pp->addr);
- if (!vma || !vma_migratable(vma))
+ if (!vma || pp->addr < vma->vm_start || !vma_migratable(vma))
goto set_status;
page = follow_page(vma, pp->addr, FOLL_GET);
@@ -1204,7 +1204,7 @@
int err = -EFAULT;
vma = find_vma(mm, addr);
- if (!vma)
+ if (!vma || addr < vma->vm_start)
goto set_status;
page = follow_page(vma, addr, 0);