From mboxrd@z Thu Jan 1 00:00:00 1970 From: Christoph Hellwig Date: Thu, 21 May 2020 17:46:56 +0000 Subject: [PATCH 21/49] sctp: pass a kernel pointer to sctp_setsockopt_context Message-Id: <20200521174724.2635475-22-hch@lst.de> List-Id: References: <20200521174724.2635475-1-hch@lst.de> In-Reply-To: <20200521174724.2635475-1-hch@lst.de> MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: Vlad Yasevich , Neil Horman , Marcelo Ricardo Leitner Cc: "David S. Miller" , Jakub Kicinski , David Laight , linux-sctp@vger.kernel.org, netdev@vger.kernel.org Use the kernel pointer that sctp_setsockopt has available instead of directly handling the user pointer. Signed-off-by: Christoph Hellwig --- 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 b7bf09f86a5e7..03577684be65f 100644 --- a/net/sctp/socket.c +++ b/net/sctp/socket.c @@ -3359,40 +3359,38 @@ 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; } @@ -4697,7 +4695,7 @@ 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); -- 2.26.2