From 8a459e44ad837018ea5c34a9efe8eb4ad27ded26 Mon Sep 17 00:00:00 2001
From: Oleg Nesterov <oleg@tv-sign.ru>
Date: Mon, 4 Feb 2008 22:27:18 -0800
Subject: [PATCH] sys_remap_file_pages: fix ->vm_file accounting
Fix ->vm_file accounting, mmap_region() may do do_munmap().
Signed-off-by: Oleg Nesterov <oleg@tv-sign.ru>
Signed-off-by: Miklos Szeredi <mszeredi@suse.cz>
Cc: <stable@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---
mm/fremap.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/mm/fremap.c b/mm/fremap.c
index 14bd3bf7826e..69a37c2bdf81 100644
--- a/mm/fremap.c
+++ b/mm/fremap.c
@@ -190,10 +190,13 @@ asmlinkage long sys_remap_file_pages(unsigned long start, unsigned long size,
*/
if (mapping_cap_account_dirty(mapping)) {
unsigned long addr;
+ struct file *file = vma->vm_file;
flags &= MAP_NONBLOCK;
- addr = mmap_region(vma->vm_file, start, size,
+ get_file(file);
+ addr = mmap_region(file, start, size,
flags, vma->vm_flags, pgoff, 1);
+ fput(file);
if (IS_ERR_VALUE(addr)) {
err = addr;
} else {