[PATCH 21/51] sctp: pass a kernel pointer to sctp_setsockopt_context
From: Christoph Hellwig <hch@lst.de>
Date: 2020-07-19 07:24:15
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 | 28 +++++++++++++--------------- 1 file changed, 13 insertions(+), 15 deletions(-)
diff --git a/net/sctp/socket.c b/net/sctp/socket.c
index b29452f58ff988..2862047054d55a 100644
--- a/net/sctp/socket.c
+++ b/net/sctp/socket.c@@ -3362,40 +3362,38 @@ static int sctp_setsockopt_adaptation_layer(struct sock *sk, * received messages from the peer and does not effect the value that is * saved with outbound messages. */ -static int sctp_setsockopt_context(struct sock *sk, char __user *optval, +static int sctp_setsockopt_context(struct sock *sk, + struct sctp_assoc_value *params, unsigned int optlen) { struct sctp_sock *sp = sctp_sk(sk); - struct sctp_assoc_value params; struct sctp_association *asoc; if (optlen != sizeof(struct sctp_assoc_value)) return -EINVAL; - if (copy_from_user(¶ms, optval, optlen)) - return -EFAULT; - 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) { - asoc->default_rcv_context = params.assoc_value; + asoc->default_rcv_context = params->assoc_value; return 0; } 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_rcv_context = params.assoc_value; + if (params->assoc_id == SCTP_FUTURE_ASSOC || + params->assoc_id == SCTP_ALL_ASSOC) + sp->default_rcv_context = 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) - asoc->default_rcv_context = params.assoc_value; + asoc->default_rcv_context = params->assoc_value; return 0; }
@@ -4700,7 +4698,7 @@ static int sctp_setsockopt(struct sock *sk, int level, int optname, retval = sctp_setsockopt_adaptation_layer(sk, kopt, optlen); break; case SCTP_CONTEXT: - retval = sctp_setsockopt_context(sk, optval, optlen); + retval = sctp_setsockopt_context(sk, kopt, optlen); break; case SCTP_FRAGMENT_INTERLEAVE: retval = sctp_setsockopt_fragment_interleave(sk, optval, optlen);
--
2.27.0