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can: Fix copy_from_user() results interpretation 

Both copy_to_ and _from_user return the number of bytes, that failed to
reach their destination, not the 0/-EXXX values.

Based on patch from Pavel Emelyanov <xemul@openvz.org>

Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
Acked-by: Oliver Hartkopp <oliver.hartkopp@volkswagen.de>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Sam Ravnborg 2008-04-26 22:57:25 -07:00 committed by David S. Miller
parent 5c5d6dabb7
commit 3f91bd420a
1 changed files with 10 additions and 11 deletions
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21
net/can/raw.c
View File

@ -435,15 +435,13 @@ static int raw_setsockopt(struct socket *sock, int level, int optname,
if (!filter)
return -ENOMEM;
err = copy_from_user(filter, optval, optlen);
if (err) {
if (copy_from_user(filter, optval, optlen)) {
kfree(filter);
return err;
return -EFAULT;
}
} else if (count == 1) {
err = copy_from_user(&sfilter, optval, optlen);
if (err)
return err;
if (copy_from_user(&sfilter, optval, optlen))
return -EFAULT;
}
lock_sock(sk);
@ -493,9 +491,8 @@ static int raw_setsockopt(struct socket *sock, int level, int optname,
if (optlen != sizeof(err_mask))
return -EINVAL;
err = copy_from_user(&err_mask, optval, optlen);
if (err)
return err;
if (copy_from_user(&err_mask, optval, optlen))
return -EFAULT;
err_mask &= CAN_ERR_MASK;
@ -531,7 +528,8 @@ static int raw_setsockopt(struct socket *sock, int level, int optname,
if (optlen != sizeof(ro->loopback))
return -EINVAL;
err = copy_from_user(&ro->loopback, optval, optlen);
if (copy_from_user(&ro->loopback, optval, optlen))
return -EFAULT;
break;
@ -539,7 +537,8 @@ static int raw_setsockopt(struct socket *sock, int level, int optname,
if (optlen != sizeof(ro->recv_own_msgs))
return -EINVAL;
err = copy_from_user(&ro->recv_own_msgs, optval, optlen);
if (copy_from_user(&ro->recv_own_msgs, optval, optlen))
return -EFAULT;
break;