From mboxrd@z Thu Jan 1 00:00:00 1970 From: Christoph Hellwig Date: Sun, 19 Jul 2020 07:22:01 +0000 Subject: [PATCH 24/51] sctp: pass a kernel pointer to sctp_setsockopt_auth_chunk Message-Id: <20200719072228.112645-25-hch@lst.de> List-Id: References: <20200719072228.112645-1-hch@lst.de> In-Reply-To: <20200719072228.112645-1-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 | 11 ++++------- 1 file changed, 4 insertions(+), 7 deletions(-) diff --git a/net/sctp/socket.c b/net/sctp/socket.c index ac7dff849290dc..f68aa3936df3f3 100644 --- a/net/sctp/socket.c +++ b/net/sctp/socket.c @@ -3535,21 +3535,18 @@ static int sctp_setsockopt_maxburst(struct sock *sk, * will only effect future associations on the socket. */ static int sctp_setsockopt_auth_chunk(struct sock *sk, - char __user *optval, + struct sctp_authchunk *val, unsigned int optlen) { struct sctp_endpoint *ep = sctp_sk(sk)->ep; - struct sctp_authchunk val; if (!ep->auth_enable) return -EACCES; if (optlen != sizeof(struct sctp_authchunk)) return -EINVAL; - if (copy_from_user(&val, optval, optlen)) - return -EFAULT; - switch (val.sauth_chunk) { + switch (val->sauth_chunk) { case SCTP_CID_INIT: case SCTP_CID_INIT_ACK: case SCTP_CID_SHUTDOWN_COMPLETE: @@ -3558,7 +3555,7 @@ static int sctp_setsockopt_auth_chunk(struct sock *sk, } /* add this chunk id to the endpoint */ - return sctp_auth_ep_add_chunkid(ep, val.sauth_chunk); + return sctp_auth_ep_add_chunkid(ep, val->sauth_chunk); } /* @@ -4699,7 +4696,7 @@ static int sctp_setsockopt(struct sock *sk, int level, int optname, retval = sctp_setsockopt_maxburst(sk, kopt, optlen); break; case SCTP_AUTH_CHUNK: - retval = sctp_setsockopt_auth_chunk(sk, optval, optlen); + retval = sctp_setsockopt_auth_chunk(sk, kopt, optlen); break; case SCTP_HMAC_IDENT: retval = sctp_setsockopt_hmac_ident(sk, optval, optlen); -- 2.27.0