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net: Fix wrong interpretation of some copy_to_user() results. 

I found some places, that erroneously return the value obtained from
the copy_to_user() call: if some amount of bytes were not able to get
to the user (this is what this one returns) the proper behavior is to
return the -EFAULT error, not that number itself.

Signed-off-by: Pavel Emelyanov <xemul@openvz.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Pavel Emelyanov 2008-04-25 01:49:48 -07:00 committed by David S. Miller
parent cc93d7d77d
commit 653252c230
3 changed files with 5 additions and 4 deletions
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3
net/can/raw.c
View File

@ -573,7 +573,8 @@ static int raw_getsockopt(struct socket *sock, int level, int optname,
int fsize = ro->count * sizeof(struct can_filter);
if (len > fsize)
len = fsize;
err = copy_to_user(optval, ro->filter, len);
if (copy_to_user(optval, ro->filter, len))
err = -EFAULT;
} else
len = 0;
release_sock(sk);

2
net/dccp/probe.c
View File

@ -140,7 +140,7 @@ static ssize_t dccpprobe_read(struct file *file, char __user *buf,
goto out_free;
cnt = kfifo_get(dccpw.fifo, tbuf, len);
error = copy_to_user(buf, tbuf, cnt);
error = copy_to_user(buf, tbuf, cnt) ? -EFAULT : 0;
out_free:
vfree(tbuf);

4
net/tipc/socket.c
View File

@ -1756,8 +1756,8 @@ static int getsockopt(struct socket *sock,
else if (len < sizeof(value)) {
res = -EINVAL;
}
else if ((res = copy_to_user(ov, &value, sizeof(value)))) {
/* couldn't return value */
else if (copy_to_user(ov, &value, sizeof(value))) {
res = -EFAULT;
}
else {
res = put_user(sizeof(value), ol);