[patch] isdn/kcapi: return -EFAULT on copy_from_user errors

Dan Carpenter
2010-06-03T09:56:13Z

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>

diff --git a/drivers/isdn/capi/kcapi.c b/drivers/isdn/capi/kcapi.c
index bde3c88..b054494 100644
--- 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;