Use the kernel pointer that sctp_setsockopt has available instead of directly handling the user pointer.
Signed-off-by: Christoph Hellwig <h...@lst.de> --- net/sctp/socket.c | 55 ++++++++++++++++++++++------------------------- 1 file changed, 26 insertions(+), 29 deletions(-) diff --git a/net/sctp/socket.c b/net/sctp/socket.c index 64f2a967ddf5d3..ea027ea74ba557 100644 --- a/net/sctp/socket.c +++ b/net/sctp/socket.c @@ -3840,66 +3840,63 @@ static int sctp_setsockopt_auto_asconf(struct sock *sk, int *val, * http://www.ietf.org/id/draft-nishida-tsvwg-sctp-failover-05.txt */ static int sctp_setsockopt_paddr_thresholds(struct sock *sk, - char __user *optval, + struct sctp_paddrthlds_v2 *val, unsigned int optlen, bool v2) { - struct sctp_paddrthlds_v2 val; struct sctp_transport *trans; struct sctp_association *asoc; int len; - len = v2 ? sizeof(val) : sizeof(struct sctp_paddrthlds); + len = v2 ? sizeof(*val) : sizeof(struct sctp_paddrthlds); if (optlen < len) return -EINVAL; - if (copy_from_user(&val, optval, len)) - return -EFAULT; - if (v2 && val.spt_pathpfthld > val.spt_pathcpthld) + if (v2 && val->spt_pathpfthld > val->spt_pathcpthld) return -EINVAL; - if (!sctp_is_any(sk, (const union sctp_addr *)&val.spt_address)) { - trans = sctp_addr_id2transport(sk, &val.spt_address, - val.spt_assoc_id); + if (!sctp_is_any(sk, (const union sctp_addr *)&val->spt_address)) { + trans = sctp_addr_id2transport(sk, &val->spt_address, + val->spt_assoc_id); if (!trans) return -ENOENT; - if (val.spt_pathmaxrxt) - trans->pathmaxrxt = val.spt_pathmaxrxt; + if (val->spt_pathmaxrxt) + trans->pathmaxrxt = val->spt_pathmaxrxt; if (v2) - trans->ps_retrans = val.spt_pathcpthld; - trans->pf_retrans = val.spt_pathpfthld; + trans->ps_retrans = val->spt_pathcpthld; + trans->pf_retrans = val->spt_pathpfthld; return 0; } - asoc = sctp_id2assoc(sk, val.spt_assoc_id); - if (!asoc && val.spt_assoc_id != SCTP_FUTURE_ASSOC && + asoc = sctp_id2assoc(sk, val->spt_assoc_id); + if (!asoc && val->spt_assoc_id != SCTP_FUTURE_ASSOC && sctp_style(sk, UDP)) return -EINVAL; if (asoc) { list_for_each_entry(trans, &asoc->peer.transport_addr_list, transports) { - if (val.spt_pathmaxrxt) - trans->pathmaxrxt = val.spt_pathmaxrxt; + if (val->spt_pathmaxrxt) + trans->pathmaxrxt = val->spt_pathmaxrxt; if (v2) - trans->ps_retrans = val.spt_pathcpthld; - trans->pf_retrans = val.spt_pathpfthld; + trans->ps_retrans = val->spt_pathcpthld; + trans->pf_retrans = val->spt_pathpfthld; } - if (val.spt_pathmaxrxt) - asoc->pathmaxrxt = val.spt_pathmaxrxt; + if (val->spt_pathmaxrxt) + asoc->pathmaxrxt = val->spt_pathmaxrxt; if (v2) - asoc->ps_retrans = val.spt_pathcpthld; - asoc->pf_retrans = val.spt_pathpfthld; + asoc->ps_retrans = val->spt_pathcpthld; + asoc->pf_retrans = val->spt_pathpfthld; } else { struct sctp_sock *sp = sctp_sk(sk); - if (val.spt_pathmaxrxt) - sp->pathmaxrxt = val.spt_pathmaxrxt; + if (val->spt_pathmaxrxt) + sp->pathmaxrxt = val->spt_pathmaxrxt; if (v2) - sp->ps_retrans = val.spt_pathcpthld; - sp->pf_retrans = val.spt_pathpfthld; + sp->ps_retrans = val->spt_pathcpthld; + sp->pf_retrans = val->spt_pathpfthld; } return 0; @@ -4690,11 +4687,11 @@ static int sctp_setsockopt(struct sock *sk, int level, int optname, retval = sctp_setsockopt_auto_asconf(sk, kopt, optlen); break; case SCTP_PEER_ADDR_THLDS: - retval = sctp_setsockopt_paddr_thresholds(sk, optval, optlen, + retval = sctp_setsockopt_paddr_thresholds(sk, kopt, optlen, false); break; case SCTP_PEER_ADDR_THLDS_V2: - retval = sctp_setsockopt_paddr_thresholds(sk, optval, optlen, + retval = sctp_setsockopt_paddr_thresholds(sk, kopt, optlen, true); break; case SCTP_RECVRCVINFO: -- 2.27.0
