[PATCH 43/51] sctp: pass a kernel pointer to sctp_setsockopt_scheduler_value
From: Christoph Hellwig <hch@lst.de>
Date: 2020-07-19 07:23:38
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 | 26 ++++++++++---------------- 1 file changed, 10 insertions(+), 16 deletions(-)
diff --git a/net/sctp/socket.c b/net/sctp/socket.c
index a7d6a66fbe2113..4b660e6bf3bb54 100644
--- a/net/sctp/socket.c
+++ b/net/sctp/socket.c@@ -4158,38 +4158,32 @@ static int sctp_setsockopt_scheduler(struct sock *sk, } static int sctp_setsockopt_scheduler_value(struct sock *sk, - char __user *optval, + struct sctp_stream_value *params, unsigned int optlen) { - struct sctp_stream_value params; struct sctp_association *asoc; int retval = -EINVAL; - if (optlen < sizeof(params)) - goto out; - - optlen = sizeof(params); - if (copy_from_user(¶ms, optval, optlen)) { - retval = -EFAULT; + if (optlen < sizeof(*params)) goto out; - } - asoc = sctp_id2assoc(sk, params.assoc_id); - if (!asoc && params.assoc_id != SCTP_CURRENT_ASSOC && + asoc = sctp_id2assoc(sk, params->assoc_id); + if (!asoc && params->assoc_id != SCTP_CURRENT_ASSOC && sctp_style(sk, UDP)) goto out; if (asoc) { - retval = sctp_sched_set_value(asoc, params.stream_id, - params.stream_value, GFP_KERNEL); + retval = sctp_sched_set_value(asoc, params->stream_id, + params->stream_value, GFP_KERNEL); goto out; } retval = 0; list_for_each_entry(asoc, &sctp_sk(sk)->ep->asocs, asocs) { - int ret = sctp_sched_set_value(asoc, params.stream_id, - params.stream_value, GFP_KERNEL); + int ret = sctp_sched_set_value(asoc, params->stream_id, + params->stream_value, + GFP_KERNEL); if (ret && !retval) /* try to return the 1st error. */ retval = ret; }
@@ -4658,7 +4652,7 @@ static int sctp_setsockopt(struct sock *sk, int level, int optname, retval = sctp_setsockopt_scheduler(sk, kopt, optlen); break; case SCTP_STREAM_SCHEDULER_VALUE: - retval = sctp_setsockopt_scheduler_value(sk, optval, optlen); + retval = sctp_setsockopt_scheduler_value(sk, kopt, optlen); break; case SCTP_INTERLEAVING_SUPPORTED: retval = sctp_setsockopt_interleaving_supported(sk, optval,
--
2.27.0