[patch 25/45] sys_remap_file_pages: fix ->vm_file accounting

[Greg KH]

2.6.24-stable review patch.  If anyone has any objections, please let us know.

------------------
From: Oleg Nesterov <oleg@xxxxxxxxxx>

patch 8a459e44ad837018ea5c34a9efe8eb4ad27ded26 in mainline.

Fix ->vm_file accounting, mmap_region() may do do_munmap().

Signed-off-by: Oleg Nesterov <oleg@xxxxxxxxxx>
Signed-off-by: Miklos Szeredi <mszeredi@xxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxx>
---

 mm/fremap.c |    5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

--- a/mm/fremap.c
+++ b/mm/fremap.c
@@ -190,10 +190,13 @@ asmlinkage long sys_remap_file_pages(uns
 		 */
 		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 {

-- 
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