1 files changed, 5 insertions, 2 deletions

diff --git a/drivers/isdn/i4l/isdn_common.c b/drivers/isdn/i4l/isdn_common.c
index 0f3c66de69bc..7188c59a76ff 100644
--- a/drivers/isdn/i4l/isdn_common.c
+++ b/drivers/isdn/i4l/isdn_common.c
@@ -1732,7 +1732,7 @@ isdn_open(struct inode *ino, struct file *filep)
         int chidx;
         int retval = -ENODEV;
 
-
+        lock_kernel();
         if (minor == ISDN_MINOR_STATUS) {
                 infostruct *p;
 
@@ -1783,6 +1783,7 @@ isdn_open(struct inode *ino, struct file *filep)
 #endif
  out:
         nonseekable_open(ino, filep);
+        unlock_kernel();
         return retval;
 }
 
@@ -1977,8 +1978,10 @@ isdn_writebuf_stub(int drvidx, int chan, const u_char __user * buf, int len)
         if (!skb)
                 return -ENOMEM;
         skb_reserve(skb, hl);
-        if (copy_from_user(skb_put(skb, len), buf, len))
+        if (copy_from_user(skb_put(skb, len), buf, len)) {
+                dev_kfree_skb(skb);
                 return -EFAULT;
+        }
         ret = dev->drv[drvidx]->interface->writebuf_skb(drvidx, chan, 1, skb);
         if (ret <= 0)
                 dev_kfree_skb(skb);