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sctp: pass a kernel pointer to sctp_setsockopt_primary_addr 

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 09:21:50 +02:00 committed by David S. Miller
parent 8a2409d356
commit 1eec695804
1 changed files with 5 additions and 9 deletions
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14
net/sctp/socket.c
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@ -2982,10 +2982,9 @@ static int sctp_setsockopt_default_sndinfo(struct sock *sk,
* the association primary. The enclosed address must be one of the
* association peer's addresses.
*/
static int sctp_setsockopt_primary_addr(struct sock *sk, char __user *optval,
static int sctp_setsockopt_primary_addr(struct sock *sk, struct sctp_prim *prim,
unsigned int optlen)
{
struct sctp_prim prim;
struct sctp_transport *trans;
struct sctp_af *af;
int err;
@ -2993,21 +2992,18 @@ static int sctp_setsockopt_primary_addr(struct sock *sk, char __user *optval,
if (optlen != sizeof(struct sctp_prim))
return -EINVAL;
if (copy_from_user(&prim, optval, sizeof(struct sctp_prim)))
return -EFAULT;
/* Allow security module to validate address but need address len. */
af = sctp_get_af_specific(prim.ssp_addr.ss_family);
af = sctp_get_af_specific(prim->ssp_addr.ss_family);
if (!af)
return -EINVAL;
err = security_sctp_bind_connect(sk, SCTP_PRIMARY_ADDR,
(struct sockaddr *)&prim.ssp_addr,
(struct sockaddr *)&prim->ssp_addr,
af->sockaddr_len);
if (err)
return err;
trans = sctp_addr_id2transport(sk, &prim.ssp_addr, prim.ssp_assoc_id);
trans = sctp_addr_id2transport(sk, &prim->ssp_addr, prim->ssp_assoc_id);
if (!trans)
return -EINVAL;
@ -4695,7 +4691,7 @@ static int sctp_setsockopt(struct sock *sk, int level, int optname,
retval = sctp_setsockopt_default_sndinfo(sk, kopt, optlen);
break;
case SCTP_PRIMARY_ADDR:
retval = sctp_setsockopt_primary_addr(sk, optval, optlen);
retval = sctp_setsockopt_primary_addr(sk, kopt, optlen);
break;
case SCTP_SET_PEER_PRIMARY_ADDR:
retval = sctp_setsockopt_peer_primary_addr(sk, optval, optlen);