[PATCH] autofs4: avoid panic on bind mount of autofs owned directory

[linux-2.6-omap-h63xx.git] / fs / autofs4 / root.c

diff --git a/fs/autofs4/root.c b/fs/autofs4/root.c
index 3765c047f157e76f4e1e760460db22e71c3744a0..e137acf0543dffb931c83d04d4cac1ee5f83461b 100644 (file)
--- a/fs/autofs4/root.c
+++ b/fs/autofs4/root.c
@@ -205,7 +205,11 @@ static int autofs4_dir_open(struct inode *inode, struct file *file)
                struct vfsmount *fp_mnt = mntget(mnt);
                struct dentry *fp_dentry = dget(dentry);
 
-               while (follow_down(&fp_mnt, &fp_dentry) && d_mountpoint(fp_dentry));
+               if (!autofs4_follow_mount(&fp_mnt, &fp_dentry)) {
+                       dput(fp_dentry);
+                       mntput(fp_mnt);
+                       return -ENOENT;
+               }
 
                fp = dentry_open(fp_dentry, fp_mnt, file->f_flags);
                status = PTR_ERR(fp);