From mboxrd@z Thu Jan 1 00:00:00 1970 From: Christoph Hellwig Date: Wed, 13 May 2020 08:26:41 +0200 Subject: [Ocfs2-devel] [PATCH 26/33] sctp: lift copying in addrs into sctp_setsockopt In-Reply-To: <20200513062649.2100053-1-hch@lst.de> References: <20200513062649.2100053-1-hch@lst.de> Message-ID: <20200513062649.2100053-27-hch@lst.de> List-Id: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: "David S. Miller" , Jakub Kicinski Cc: Marcelo Ricardo Leitner , Eric Dumazet , linux-nvme@lists.infradead.org, linux-sctp@vger.kernel.org, target-devel@vger.kernel.org, linux-afs@lists.infradead.org, linux-cifs@vger.kernel.org, rds-devel@oss.oracle.com, linux-rdma@vger.kernel.org, cluster-devel@redhat.com, Alexey Kuznetsov , linux-block@vger.kernel.org, drbd-dev@tron.linbit.com, ceph-devel@vger.kernel.org, linux-nfs@vger.kernel.org, Neil Horman , Hideaki YOSHIFUJI , netdev@vger.kernel.org, Vlad Yasevich , linux-kernel@vger.kernel.org, Jon Maloy , Ying Xue , ocfs2-devel@oss.oracle.com Prepare for additional kernel-space callers of sctp_setsockopt_bindx. Signed-off-by: Christoph Hellwig --- net/sctp/socket.c | 71 ++++++++++++++++++----------------------------- 1 file changed, 27 insertions(+), 44 deletions(-) diff --git a/net/sctp/socket.c b/net/sctp/socket.c index 827a9903ee288..1c96b52c4aa28 100644 --- a/net/sctp/socket.c +++ b/net/sctp/socket.c @@ -972,18 +972,16 @@ int sctp_asconf_mgmt(struct sctp_sock *sp, struct sctp_sockaddr_entry *addrw) * it. * * sk The sk of the socket - * addrs The pointer to the addresses in user land + * addrs The pointer to the addresses * addrssize Size of the addrs buffer * op Operation to perform (add or remove, see the flags of * sctp_bindx) * * Returns 0 if ok, <0 errno code on error. */ -static int sctp_setsockopt_bindx(struct sock *sk, - struct sockaddr __user *addrs, +static int sctp_setsockopt_bindx(struct sock *sk, struct sockaddr *kaddrs, int addrs_size, int op) { - struct sockaddr *kaddrs; int err; int addrcnt = 0; int walk_size = 0; @@ -991,23 +989,13 @@ static int sctp_setsockopt_bindx(struct sock *sk, void *addr_buf; struct sctp_af *af; - pr_debug("%s: sk:%p addrs:%p addrs_size:%d opt:%d\n", - __func__, sk, addrs, addrs_size, op); - - if (unlikely(addrs_size <= 0)) - return -EINVAL; + pr_debug("%s: sk:%p kaddrs:%p addrs_size:%d opt:%d\n", + __func__, sk, kaddrs, addrs_size, op); - kaddrs = memdup_user(addrs, addrs_size); - if (IS_ERR(kaddrs)) - return PTR_ERR(kaddrs); - - /* Walk through the addrs buffer and count the number of addresses. */ addr_buf = kaddrs; while (walk_size < addrs_size) { - if (walk_size + sizeof(sa_family_t) > addrs_size) { - kfree(kaddrs); + if (walk_size + sizeof(sa_family_t) > addrs_size) return -EINVAL; - } sa_addr = addr_buf; af = sctp_get_af_specific(sa_addr->sa_family); @@ -1015,10 +1003,8 @@ static int sctp_setsockopt_bindx(struct sock *sk, /* If the address family is not supported or if this address * causes the address buffer to overflow return EINVAL. */ - if (!af || (walk_size + af->sockaddr_len) > addrs_size) { - kfree(kaddrs); + if (!af || (walk_size + af->sockaddr_len) > addrs_size) return -EINVAL; - } addrcnt++; addr_buf += af->sockaddr_len; walk_size += af->sockaddr_len; @@ -1032,29 +1018,19 @@ static int sctp_setsockopt_bindx(struct sock *sk, (struct sockaddr *)kaddrs, addrs_size); if (err) - goto out; + return err; err = sctp_bindx_add(sk, kaddrs, addrcnt); if (err) - goto out; - err = sctp_send_asconf_add_ip(sk, kaddrs, addrcnt); - break; - + return err; + return sctp_send_asconf_add_ip(sk, kaddrs, addrcnt); case SCTP_BINDX_REM_ADDR: err = sctp_bindx_rem(sk, kaddrs, addrcnt); if (err) - goto out; - err = sctp_send_asconf_del_ip(sk, kaddrs, addrcnt); - break; - + return err; + return sctp_send_asconf_del_ip(sk, kaddrs, addrcnt); default: - err = -EINVAL; - break; + return -EINVAL; } - -out: - kfree(kaddrs); - - return err; } static int sctp_connect_new_asoc(struct sctp_endpoint *ep, @@ -4670,6 +4646,7 @@ static int sctp_setsockopt_pf_expose(struct sock *sk, static int sctp_setsockopt(struct sock *sk, int level, int optname, char __user *optval, unsigned int optlen) { + struct sockaddr *kaddrs; int retval = 0; pr_debug("%s: sk:%p, optname:%d\n", __func__, sk, optname); @@ -4682,30 +4659,37 @@ static int sctp_setsockopt(struct sock *sk, int level, int optname, */ if (level != SOL_SCTP) { struct sctp_af *af = sctp_sk(sk)->pf->af; - retval = af->setsockopt(sk, level, optname, optval, optlen); - goto out_nounlock; + return af->setsockopt(sk, level, optname, optval, optlen); } + if (unlikely(optlen <= 0)) + return -EINVAL; + + kaddrs = memdup_user(optval, optlen); + if (IS_ERR(kaddrs)) + return PTR_ERR(kaddrs); + + /* Walk through the addrs buffer and count the number of addresses. */ + lock_sock(sk); switch (optname) { case SCTP_SOCKOPT_BINDX_ADD: /* 'optlen' is the size of the addresses buffer. */ - retval = sctp_setsockopt_bindx(sk, (struct sockaddr __user *)optval, + retval = sctp_setsockopt_bindx(sk, (struct sockaddr *)optval, optlen, SCTP_BINDX_ADD_ADDR); break; case SCTP_SOCKOPT_BINDX_REM: /* 'optlen' is the size of the addresses buffer. */ - retval = sctp_setsockopt_bindx(sk, (struct sockaddr __user *)optval, + retval = sctp_setsockopt_bindx(sk, (struct sockaddr *)optval, optlen, SCTP_BINDX_REM_ADDR); break; case SCTP_SOCKOPT_CONNECTX_OLD: /* 'optlen' is the size of the addresses buffer. */ retval = sctp_setsockopt_connectx_old(sk, - (struct sockaddr __user *)optval, - optlen); + (struct sockaddr *)optval, optlen); break; case SCTP_SOCKOPT_CONNECTX: @@ -4871,8 +4855,7 @@ static int sctp_setsockopt(struct sock *sk, int level, int optname, } release_sock(sk); - -out_nounlock: + kfree(kaddrs); return retval; } -- 2.26.2