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sctp: pass a kernel pointer to sctp_setsockopt_initmsg 

Use the kernel pointer that sctp_setsockopt has available instead of
directly handling the user pointer.

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 09:21:47 +02:00 committed by David S. Miller
parent bb13d647d9
commit 9dfa6f0494
1 changed files with 11 additions and 13 deletions
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24
net/sctp/socket.c
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@ -2832,24 +2832,22 @@ static int sctp_setsockopt_delayed_ack(struct sock *sk,
* by the change). With TCP-style sockets, this option is inherited by
* sockets derived from a listener socket.
*/
static int sctp_setsockopt_initmsg(struct sock *sk, char __user *optval, unsigned int optlen)
static int sctp_setsockopt_initmsg(struct sock *sk, struct sctp_initmsg *sinit,
unsigned int optlen)
{
struct sctp_initmsg sinit;
struct sctp_sock *sp = sctp_sk(sk);
if (optlen != sizeof(struct sctp_initmsg))
return -EINVAL;
if (copy_from_user(&sinit, optval, optlen))
return -EFAULT;
if (sinit.sinit_num_ostreams)
sp->initmsg.sinit_num_ostreams = sinit.sinit_num_ostreams;
if (sinit.sinit_max_instreams)
sp->initmsg.sinit_max_instreams = sinit.sinit_max_instreams;
if (sinit.sinit_max_attempts)
sp->initmsg.sinit_max_attempts = sinit.sinit_max_attempts;
if (sinit.sinit_max_init_timeo)
sp->initmsg.sinit_max_init_timeo = sinit.sinit_max_init_timeo;
if (sinit->sinit_num_ostreams)
sp->initmsg.sinit_num_ostreams = sinit->sinit_num_ostreams;
if (sinit->sinit_max_instreams)
sp->initmsg.sinit_max_instreams = sinit->sinit_max_instreams;
if (sinit->sinit_max_attempts)
sp->initmsg.sinit_max_attempts = sinit->sinit_max_attempts;
if (sinit->sinit_max_init_timeo)
sp->initmsg.sinit_max_init_timeo = sinit->sinit_max_init_timeo;
return 0;
}
@ -4694,7 +4692,7 @@ static int sctp_setsockopt(struct sock *sk, int level, int optname,
break;
case SCTP_INITMSG:
retval = sctp_setsockopt_initmsg(sk, optval, optlen);
retval = sctp_setsockopt_initmsg(sk, kopt, optlen);
break;
case SCTP_DEFAULT_SEND_PARAM:
retval = sctp_setsockopt_default_send_param(sk, optval,