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sctp: copy the optval from user space in sctp_setsockopt

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Prepare for for moving the copy_from_user from the individual sockopts
to the main setsockopt helper.  As of this commit the kopt variable
is not used yet, but the following commits will start using it.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Christoph Hellwig 2020-07-19 09:21:38 +02:00 committed by David S. Miller
parent 9aa0dfe1fc
commit ca84bd058d
1 changed files with 8 additions and 0 deletions
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8
net/sctp/socket.c
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@ -4677,6 +4677,7 @@ out:
static int sctp_setsockopt(struct sock *sk, int level, int optname,
char __user *optval, unsigned int optlen)
{
void *kopt = NULL;
int retval = 0;
pr_debug("%s: sk:%p, optname:%d\n", __func__, sk, optname);
@ -4693,6 +4694,12 @@ static int sctp_setsockopt(struct sock *sk, int level, int optname,
goto out_nounlock;
}
if (optlen > 0) {
kopt = memdup_user(optval, optlen);
if (IS_ERR(kopt))
return PTR_ERR(kopt);
}
lock_sock(sk);
switch (optname) {
@ -4878,6 +4885,7 @@ static int sctp_setsockopt(struct sock *sk, int level, int optname,
}
release_sock(sk);
kfree(kopt);
out_nounlock:
return retval;