sys_remap_file_pages: fix ->vm_file accounting

Fix ->vm_file accounting, mmap_region() may do do_munmap(). Signed-off-by: Oleg Nesterov <[email protected]> Signed-off-by: Miklos Szeredi <[email protected]> Cc: <[email protected]> Signed-off-by: Andrew Morton <[email protected]> Signed-off-by: Linus Torvalds <[email protected]>
niw · Feb 5, 2008 · 8a459e4 · 8a459e4
1 parent c0b49b0
commit 8a459e4
Showing 1 changed file with 4 additions and 1 deletion.
diff --git 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 {