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authorSam Ravnborg <sam@ravnborg.org>2008-04-26 22:57:25 -0700
committerDavid S. Miller <davem@davemloft.net>2008-04-27 14:26:51 -0700
commit3f91bd420a955803421f2db17b2e04aacfbb2bb8 (patch)
tree52f47db69004eddcd22bfa69246d08632dfcd256 /net/can
parent5c5d6dabb7aac9d0ea7aa76b909bbd28efa99065 (diff)
downloadlinux-2.6.38-lt-ux500-3f91bd420a955803421f2db17b2e04aacfbb2bb8.tar.gz
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>
Diffstat (limited to 'net/can')
-rw-r--r--net/can/raw.c21
1 files changed, 10 insertions, 11 deletions
diff --git a/net/can/raw.c b/net/can/raw.c
index 201cbfc6b9e..69877b8e7e9 100644
--- a/net/can/raw.c
+++ b/net/can/raw.c
@@ -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;