From mboxrd@z Thu Jan 1 00:00:00 1970 From: Christoph Hellwig Date: Thu, 21 May 2020 17:46:54 +0000 Subject: [PATCH 19/49] sctp: pass a kernel pointer to sctp_setsockopt_maxseg Message-Id: <20200521174724.2635475-20-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 | 22 +++++++++++----------- 1 file changed, 11 insertions(+), 11 deletions(-) diff --git a/net/sctp/socket.c b/net/sctp/socket.c index 41407d0ef2eca..4374d4fff080a 100644 --- a/net/sctp/socket.c +++ b/net/sctp/socket.c @@ -3212,11 +3212,13 @@ static int sctp_setsockopt_mappedv4(struct sock *sk, int *val, * changed (effecting future associations only). * assoc_value: This parameter specifies the maximum size in bytes. */ -static int sctp_setsockopt_maxseg(struct sock *sk, char __user *optval, unsigned int optlen) +static int sctp_setsockopt_maxseg(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; + sctp_assoc_t assoc_id; int val; if (optlen = sizeof(int)) { @@ -3225,19 +3227,17 @@ static int sctp_setsockopt_maxseg(struct sock *sk, char __user *optval, unsigned "Use of int in maxseg socket option.\n" "Use struct sctp_assoc_value instead\n", current->comm, task_pid_nr(current)); - if (copy_from_user(&val, optval, optlen)) - return -EFAULT; - params.assoc_id = SCTP_FUTURE_ASSOC; + assoc_id = SCTP_FUTURE_ASSOC; + val = *(int *)params; } else if (optlen = sizeof(struct sctp_assoc_value)) { - if (copy_from_user(¶ms, optval, optlen)) - return -EFAULT; - val = params.assoc_value; + assoc_id = params->assoc_id; + val = params->assoc_value; } else { return -EINVAL; } - asoc = sctp_id2assoc(sk, params.assoc_id); - if (!asoc && params.assoc_id != SCTP_FUTURE_ASSOC && + asoc = sctp_id2assoc(sk, assoc_id); + if (!asoc && assoc_id != SCTP_FUTURE_ASSOC && sctp_style(sk, UDP)) return -EINVAL; @@ -4694,7 +4694,7 @@ static int sctp_setsockopt(struct sock *sk, int level, int optname, retval = sctp_setsockopt_mappedv4(sk, kopt, optlen); break; case SCTP_MAXSEG: - retval = sctp_setsockopt_maxseg(sk, optval, optlen); + retval = sctp_setsockopt_maxseg(sk, kopt, optlen); break; case SCTP_ADAPTATION_LAYER: retval = sctp_setsockopt_adaptation_layer(sk, optval, optlen); -- 2.26.2