1 files changed, 2 insertions, 1 deletions

diff --git a/drivers/isdn/i4l/isdn_ppp.c b/drivers/isdn/i4l/isdn_ppp.c
index 1a19a0f89428..b9fed8a3bcc6 100644
--- a/drivers/isdn/i4l/isdn_ppp.c
+++ b/drivers/isdn/i4l/isdn_ppp.c
@@ -782,7 +782,8 @@ isdn_ppp_read(int min, struct file *file, char __user *buf, int count)
         is->first = b;
 
         spin_unlock_irqrestore(&is->buflock, flags);
-        copy_to_user(buf, save_buf, count);
+        if (copy_to_user(buf, save_buf, count))
+                count = -EFAULT;
         kfree(save_buf);
 
         return count;