isdn/kcapi: return -EFAULT on copy_from_user errors

copy_from_user() returns the number of bytes remaining but we should
return -EFAULT here.  The error code gets returned to the user.  Both
old_capi_manufacturer() and capi20_manufacturer() had other places
that already returned -EFAULT so this won't break anything.

Signed-off-by: Dan Carpenter <error27@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/isdn/capi/kcapi.c b/drivers/isdn/capi/kcapi.c
index bde3c88..b054494 100644 (file)
--- a/drivers/isdn/capi/kcapi.c
+++ b/drivers/isdn/capi/kcapi.c
@@ -1020,12 +1020,12 @@ static int old_capi_manufacturer(unsigned int cmd, void __user *data)
                if (cmd == AVMB1_ADDCARD) {
                   if ((retval = copy_from_user(&cdef, data,
                                            sizeof(avmb1_carddef))))
-                          return retval;
+                          return -EFAULT;
                   cdef.cardtype = AVM_CARDTYPE_B1;
                } else {
                   if ((retval = copy_from_user(&cdef, data,
                                            sizeof(avmb1_extcarddef))))
-                          return retval;
+                          return -EFAULT;
                }
                cparams.port = cdef.port;
                cparams.irq = cdef.irq;
@@ -1218,7 +1218,7 @@ int capi20_manufacturer(unsigned int cmd, void __user *data)
                kcapi_carddef cdef;
 
                if ((retval = copy_from_user(&cdef, data, sizeof(cdef))))
-                       return retval;
+                       return -EFAULT;
 
                cparams.port = cdef.port;
                cparams.irq = cdef.irq;