diff --git a/fs/file.c b/fs/file.c
index 66923fe..f3b2c20 100644
--- a/fs/file.c
+++ b/fs/file.c
@@ -750,6 +750,7 @@
 
 static int do_dup2(struct files_struct *files,
 	struct file *file, unsigned fd, unsigned flags)
+__releases(&files->file_lock)
 {
 	struct file *tofree;
 	struct fdtable *fdt;