diff --git a/fs/dcache.c b/fs/dcache.c
index 9b5fe503f6cb6c8d76044bb8272084fdb0474c9b..e3b44ca75a1b3ab2a1099197c46c604d169b37d5 100644
--- a/fs/dcache.c
+++ b/fs/dcache.c
@@ -2926,6 +2926,13 @@ static int prepend_path(const struct path *path,
 
 		if (dentry == vfsmnt->mnt_root || IS_ROOT(dentry)) {
 			struct mount *parent = ACCESS_ONCE(mnt->mnt_parent);
+			/* Escaped? */
+			if (dentry != vfsmnt->mnt_root) {
+				bptr = *buffer;
+				blen = *buflen;
+				error = 3;
+				break;
+			}
 			/* Global root? */
 			if (mnt != parent) {
 				dentry = ACCESS_ONCE(mnt->mnt_mountpoint);