[PATCH 42/51] sctp: pass a kernel pointer to sctp_setsockopt_scheduler
From: Christoph Hellwig <hch@lst.de>
Date: 2020-07-19 07:23:36
Also in:
linux-sctp
Subsystem:
networking [general], sctp protocol, the rest · Maintainers:
"David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, Marcelo Ricardo Leitner, Xin Long, Linus Torvalds
Use the kernel pointer that sctp_setsockopt has available instead of directly handling the user pointer. Signed-off-by: Christoph Hellwig <hch@lst.de> --- net/sctp/socket.c | 33 ++++++++++++++------------------- 1 file changed, 14 insertions(+), 19 deletions(-)
diff --git a/net/sctp/socket.c b/net/sctp/socket.c
index 4dedb94bca7714..a7d6a66fbe2113 100644
--- a/net/sctp/socket.c
+++ b/net/sctp/socket.c@@ -4115,44 +4115,39 @@ static int sctp_setsockopt_add_streams(struct sock *sk, } static int sctp_setsockopt_scheduler(struct sock *sk, - char __user *optval, + struct sctp_assoc_value *params, unsigned int optlen) { struct sctp_sock *sp = sctp_sk(sk); struct sctp_association *asoc; - struct sctp_assoc_value params; int retval = 0; - if (optlen < sizeof(params)) + if (optlen < sizeof(*params)) return -EINVAL; - optlen = sizeof(params); - if (copy_from_user(¶ms, optval, optlen)) - return -EFAULT; - - if (params.assoc_value > SCTP_SS_MAX) + if (params->assoc_value > SCTP_SS_MAX) return -EINVAL; - asoc = sctp_id2assoc(sk, params.assoc_id); - if (!asoc && params.assoc_id > SCTP_ALL_ASSOC && + asoc = sctp_id2assoc(sk, params->assoc_id); + if (!asoc && params->assoc_id > SCTP_ALL_ASSOC && sctp_style(sk, UDP)) return -EINVAL; if (asoc) - return sctp_sched_set_sched(asoc, params.assoc_value); + return sctp_sched_set_sched(asoc, params->assoc_value); if (sctp_style(sk, TCP)) - params.assoc_id = SCTP_FUTURE_ASSOC; + params->assoc_id = SCTP_FUTURE_ASSOC; - if (params.assoc_id == SCTP_FUTURE_ASSOC || - params.assoc_id == SCTP_ALL_ASSOC) - sp->default_ss = params.assoc_value; + if (params->assoc_id == SCTP_FUTURE_ASSOC || + params->assoc_id == SCTP_ALL_ASSOC) + sp->default_ss = params->assoc_value; - if (params.assoc_id == SCTP_CURRENT_ASSOC || - params.assoc_id == SCTP_ALL_ASSOC) { + if (params->assoc_id == SCTP_CURRENT_ASSOC || + params->assoc_id == SCTP_ALL_ASSOC) { list_for_each_entry(asoc, &sp->ep->asocs, asocs) { int ret = sctp_sched_set_sched(asoc, - params.assoc_value); + params->assoc_value); if (ret && !retval) retval = ret;
@@ -4660,7 +4655,7 @@ static int sctp_setsockopt(struct sock *sk, int level, int optname, retval = sctp_setsockopt_add_streams(sk, kopt, optlen); break; case SCTP_STREAM_SCHEDULER: - retval = sctp_setsockopt_scheduler(sk, optval, optlen); + retval = sctp_setsockopt_scheduler(sk, kopt, optlen); break; case SCTP_STREAM_SCHEDULER_VALUE: retval = sctp_setsockopt_scheduler_value(sk, optval, optlen);
--
2.27.0