1 files changed, 6 insertions, 1 deletions

diff --git a/fs/autofs4/dev-ioctl.c b/fs/autofs4/dev-ioctl.c
index ba4a38b9c22f..509fe1eb66ae 100644
--- a/fs/autofs4/dev-ioctl.c
+++ b/fs/autofs4/dev-ioctl.c
@@ -372,6 +372,10 @@ static int autofs_dev_ioctl_setpipefd(struct file *fp,
                 return -EBUSY;
         } else {
                 struct file *pipe = fget(pipefd);
+                if (!pipe) {
+                        err = -EBADF;
+                        goto out;
+                }
                 if (!pipe->f_op || !pipe->f_op->write) {
                         err = -EPIPE;
                         fput(pipe);
@@ -551,7 +555,7 @@ static int autofs_dev_ioctl_ismountpoint(struct file *fp,
 
                 err = have_submounts(path.dentry);
 
-                if (follow_down(&path))
+                if (follow_down_one(&path))
                         magic = path.mnt->mnt_sb->s_magic;
         }
 
@@ -724,6 +728,7 @@ static const struct file_operations _dev_ioctl_fops = {
         .unlocked_ioctl  = autofs_dev_ioctl,
         .compat_ioctl = autofs_dev_ioctl_compat,
         .owner   = THIS_MODULE,
+        .llseek = noop_llseek,
 };
 
 static struct miscdevice _autofs_dev_ioctl_misc = {