1 files changed, 81 insertions, 39 deletions

diff --git a/net/sctp/socket.c b/net/sctp/socket.c
index 6edaaa009d62..67861a8f00cb 100644
--- a/net/sctp/socket.c
+++ b/net/sctp/socket.c
@@ -3375,12 +3375,13 @@ static int sctp_getsockopt_sctp_status(struct sock *sk, int len,
         sctp_assoc_t associd;
         int retval = 0;
 
-        if (len != sizeof(status)) {
+        if (len < sizeof(status)) {
                 retval = -EINVAL;
                 goto out;
         }
 
-        if (copy_from_user(&status, optval, sizeof(status))) {
+        len = sizeof(status);
+        if (copy_from_user(&status, optval, len)) {
                 retval = -EFAULT;
                 goto out;
         }
@@ -3452,12 +3453,13 @@ static int sctp_getsockopt_peer_addr_info(struct sock *sk, int len,
         struct sctp_transport *transport;
         int retval = 0;
 
-        if (len != sizeof(pinfo)) {
+        if (len < sizeof(pinfo)) {
                 retval = -EINVAL;
                 goto out;
         }
 
-        if (copy_from_user(&pinfo, optval, sizeof(pinfo))) {
+        len = sizeof(pinfo);
+        if (copy_from_user(&pinfo, optval, len)) {
                 retval = -EFAULT;
                 goto out;
         }
@@ -3523,8 +3525,11 @@ static int sctp_getsockopt_disable_fragments(struct sock *sk, int len,
 static int sctp_getsockopt_events(struct sock *sk, int len, char __user *optval,
                                   int __user *optlen)
 {
-        if (len != sizeof(struct sctp_event_subscribe))
+        if (len < sizeof(struct sctp_event_subscribe))
                 return -EINVAL;
+        len = sizeof(struct sctp_event_subscribe);
+        if (put_user(len, optlen))
+                return -EFAULT;
         if (copy_to_user(optval, &sctp_sk(sk)->subscribe, len))
                 return -EFAULT;
         return 0;
@@ -3546,9 +3551,12 @@ static int sctp_getsockopt_autoclose(struct sock *sk, int len, char __user *optv
         /* Applicable to UDP-style socket only */
         if (sctp_style(sk, TCP))
                 return -EOPNOTSUPP;
-        if (len != sizeof(int))
+        if (len < sizeof(int))
                 return -EINVAL;
-        if (copy_to_user(optval, &sctp_sk(sk)->autoclose, len))
+        len = sizeof(int);
+        if (put_user(len, optlen))
+                return -EFAULT;
+        if (copy_to_user(optval, &sctp_sk(sk)->autoclose, sizeof(int)))
                 return -EFAULT;
         return 0;
 }
@@ -3599,8 +3607,9 @@ static int sctp_getsockopt_peeloff(struct sock *sk, int len, char __user *optval
         int retval = 0;
         struct sctp_association *asoc;
 
-        if (len != sizeof(sctp_peeloff_arg_t))
+        if (len < sizeof(sctp_peeloff_arg_t))
                 return -EINVAL;
+        len = sizeof(sctp_peeloff_arg_t);
         if (copy_from_user(&peeloff, optval, len))
                 return -EFAULT;
 
@@ -3628,6 +3637,8 @@ static int sctp_getsockopt_peeloff(struct sock *sk, int len, char __user *optval
 
         /* Return the fd mapped to the new socket.  */
         peeloff.sd = retval;
+        if (put_user(len, optlen))
+                return -EFAULT;
         if (copy_to_user(optval, &peeloff, len))
                 retval = -EFAULT;
 
@@ -3736,9 +3747,9 @@ static int sctp_getsockopt_peer_addr_params(struct sock *sk, int len,
         struct sctp_association *asoc = NULL;
         struct sctp_sock        *sp = sctp_sk(sk);
 
-        if (len != sizeof(struct sctp_paddrparams))
+        if (len < sizeof(struct sctp_paddrparams))
                 return -EINVAL;
-
+        len = sizeof(struct sctp_paddrparams);
         if (copy_from_user(&params, optval, len))
                 return -EFAULT;
 
@@ -3837,9 +3848,11 @@ static int sctp_getsockopt_delayed_ack_time(struct sock *sk, int len,
         struct sctp_association *asoc = NULL;
         struct sctp_sock        *sp = sctp_sk(sk);
 
-        if (len != sizeof(struct sctp_assoc_value))
+        if (len < sizeof(struct sctp_assoc_value))
                 return - EINVAL;
 
+        len = sizeof(struct sctp_assoc_value);
+
         if (copy_from_user(&params, optval, len))
                 return -EFAULT;
 
@@ -3888,8 +3901,11 @@ static int sctp_getsockopt_delayed_ack_time(struct sock *sk, int len,
  */
 static int sctp_getsockopt_initmsg(struct sock *sk, int len, char __user *optval, int __user *optlen)
 {
-        if (len != sizeof(struct sctp_initmsg))
+        if (len < sizeof(struct sctp_initmsg))
                 return -EINVAL;
+        len = sizeof(struct sctp_initmsg);
+        if (put_user(len, optlen))
+                return -EFAULT;
         if (copy_to_user(optval, &sctp_sk(sk)->initmsg, len))
                 return -EFAULT;
         return 0;
@@ -3904,7 +3920,7 @@ static int sctp_getsockopt_peer_addrs_num_old(struct sock *sk, int len,
         struct list_head *pos;
         int cnt = 0;
 
-        if (len != sizeof(sctp_assoc_t))
+        if (len < sizeof(sctp_assoc_t))
                 return -EINVAL;
 
         if (copy_from_user(&id, optval, sizeof(sctp_assoc_t)))
@@ -3940,10 +3956,12 @@ static int sctp_getsockopt_peer_addrs_old(struct sock *sk, int len,
         struct sctp_sock *sp = sctp_sk(sk);
         int addrlen;
 
-        if (len != sizeof(struct sctp_getaddrs_old))
+        if (len < sizeof(struct sctp_getaddrs_old))
                 return -EINVAL;
 
-        if (copy_from_user(&getaddrs, optval, sizeof(struct sctp_getaddrs_old)))
+        len = sizeof(struct sctp_getaddrs_old);
+
+        if (copy_from_user(&getaddrs, optval, len))
                 return -EFAULT;
 
         if (getaddrs.addr_num <= 0) return -EINVAL;
@@ -3966,7 +3984,9 @@ static int sctp_getsockopt_peer_addrs_old(struct sock *sk, int len,
                 if (cnt >= getaddrs.addr_num) break;
         }
         getaddrs.addr_num = cnt;
-        if (copy_to_user(optval, &getaddrs, sizeof(struct sctp_getaddrs_old)))
+        if (put_user(len, optlen))
+                return -EFAULT;
+        if (copy_to_user(optval, &getaddrs, len))
                 return -EFAULT;
 
         return 0;
@@ -3999,8 +4019,7 @@ static int sctp_getsockopt_peer_addrs(struct sock *sk, int len,
                 return -EINVAL;
 
         to = optval + offsetof(struct sctp_getaddrs,addrs);
-        space_left = len - sizeof(struct sctp_getaddrs) -
-                        offsetof(struct sctp_getaddrs,addrs);
+        space_left = len - offsetof(struct sctp_getaddrs,addrs);
 
         list_for_each(pos, &asoc->peer.transport_addr_list) {
                 from = list_entry(pos, struct sctp_transport, transports);
@@ -4037,7 +4056,7 @@ static int sctp_getsockopt_local_addrs_num_old(struct sock *sk, int len,
         rwlock_t *addr_lock;
         int cnt = 0;
 
-        if (len != sizeof(sctp_assoc_t))
+        if (len < sizeof(sctp_assoc_t))
                 return -EINVAL;
 
         if (copy_from_user(&id, optval, sizeof(sctp_assoc_t)))
@@ -4179,10 +4198,11 @@ static int sctp_getsockopt_local_addrs_old(struct sock *sk, int len,
         void *buf;
         int bytes_copied = 0;
 
-        if (len != sizeof(struct sctp_getaddrs_old))
+        if (len < sizeof(struct sctp_getaddrs_old))
                 return -EINVAL;
 
-        if (copy_from_user(&getaddrs, optval, sizeof(struct sctp_getaddrs_old)))
+        len = sizeof(struct sctp_getaddrs_old);
+        if (copy_from_user(&getaddrs, optval, len))
                 return -EFAULT;
 
         if (getaddrs.addr_num <= 0) return -EINVAL;
@@ -4254,7 +4274,7 @@ copy_getaddrs:
 
         /* copy the leading structure back to user */
         getaddrs.addr_num = cnt;
-        if (copy_to_user(optval, &getaddrs, sizeof(struct sctp_getaddrs_old)))
+        if (copy_to_user(optval, &getaddrs, len))
                 err = -EFAULT;
 
 error:
@@ -4282,7 +4302,7 @@ static int sctp_getsockopt_local_addrs(struct sock *sk, int len,
         void *addrs;
         void *buf;
 
-        if (len <= sizeof(struct sctp_getaddrs))
+        if (len < sizeof(struct sctp_getaddrs))
                 return -EINVAL;
 
         if (copy_from_user(&getaddrs, optval, sizeof(struct sctp_getaddrs)))
@@ -4306,8 +4326,8 @@ static int sctp_getsockopt_local_addrs(struct sock *sk, int len,
         }
 
         to = optval + offsetof(struct sctp_getaddrs,addrs);
-        space_left = len - sizeof(struct sctp_getaddrs) -
-                         offsetof(struct sctp_getaddrs,addrs);
+        space_left = len - offsetof(struct sctp_getaddrs,addrs);
+
         addrs = kmalloc(space_left, GFP_KERNEL);
         if (!addrs)
                 return -ENOMEM;
@@ -4379,10 +4399,12 @@ static int sctp_getsockopt_primary_addr(struct sock *sk, int len,
         struct sctp_association *asoc;
         struct sctp_sock *sp = sctp_sk(sk);
 
-        if (len != sizeof(struct sctp_prim))
+        if (len < sizeof(struct sctp_prim))
                 return -EINVAL;
 
-        if (copy_from_user(&prim, optval, sizeof(struct sctp_prim)))
+        len = sizeof(struct sctp_prim);
+
+        if (copy_from_user(&prim, optval, len))
                 return -EFAULT;
 
         asoc = sctp_id2assoc(sk, prim.ssp_assoc_id);
@@ -4398,7 +4420,9 @@ static int sctp_getsockopt_primary_addr(struct sock *sk, int len,
         sctp_get_pf_specific(sk->sk_family)->addr_v4map(sp,
                         (union sctp_addr *)&prim.ssp_addr);
 
-        if (copy_to_user(optval, &prim, sizeof(struct sctp_prim)))
+        if (put_user(len, optlen))
+                return -EFAULT;
+        if (copy_to_user(optval, &prim, len))
                 return -EFAULT;
 
         return 0;
@@ -4415,10 +4439,15 @@ static int sctp_getsockopt_adaptation_layer(struct sock *sk, int len,
 {
         struct sctp_setadaptation adaptation;
 
-        if (len != sizeof(struct sctp_setadaptation))
+        if (len < sizeof(struct sctp_setadaptation))
                 return -EINVAL;
 
+        len = sizeof(struct sctp_setadaptation);
+
         adaptation.ssb_adaptation_ind = sctp_sk(sk)->adaptation_ind;
+
+        if (put_user(len, optlen))
+                return -EFAULT;
         if (copy_to_user(optval, &adaptation, len))
                 return -EFAULT;
 
@@ -4452,9 +4481,12 @@ static int sctp_getsockopt_default_send_param(struct sock *sk,
         struct sctp_association *asoc;
         struct sctp_sock *sp = sctp_sk(sk);
 
-        if (len != sizeof(struct sctp_sndrcvinfo))
+        if (len < sizeof(struct sctp_sndrcvinfo))
                 return -EINVAL;
-        if (copy_from_user(&info, optval, sizeof(struct sctp_sndrcvinfo)))
+
+        len = sizeof(struct sctp_sndrcvinfo);
+
+        if (copy_from_user(&info, optval, len))
                 return -EFAULT;
 
         asoc = sctp_id2assoc(sk, info.sinfo_assoc_id);
@@ -4475,7 +4507,9 @@ static int sctp_getsockopt_default_send_param(struct sock *sk,
                 info.sinfo_timetolive = sp->default_timetolive;
         }
 
-        if (copy_to_user(optval, &info, sizeof(struct sctp_sndrcvinfo)))
+        if (put_user(len, optlen))
+                return -EFAULT;
+        if (copy_to_user(optval, &info, len))
                 return -EFAULT;
 
         return 0;
@@ -4526,10 +4560,12 @@ static int sctp_getsockopt_rtoinfo(struct sock *sk, int len,
         struct sctp_rtoinfo rtoinfo;
         struct sctp_association *asoc;
 
-        if (len != sizeof (struct sctp_rtoinfo))
+        if (len < sizeof (struct sctp_rtoinfo))
                 return -EINVAL;
 
-        if (copy_from_user(&rtoinfo, optval, sizeof (struct sctp_rtoinfo)))
+        len = sizeof(struct sctp_rtoinfo);
+
+        if (copy_from_user(&rtoinfo, optval, len))
                 return -EFAULT;
 
         asoc = sctp_id2assoc(sk, rtoinfo.srto_assoc_id);
@@ -4581,11 +4617,12 @@ static int sctp_getsockopt_associnfo(struct sock *sk, int len,
         struct list_head *pos;
         int cnt = 0;
 
-        if (len != sizeof (struct sctp_assocparams))
+        if (len < sizeof (struct sctp_assocparams))
                 return -EINVAL;
 
-        if (copy_from_user(&assocparams, optval,
-                        sizeof (struct sctp_assocparams)))
+        len = sizeof(struct sctp_assocparams);
+
+        if (copy_from_user(&assocparams, optval, len))
                 return -EFAULT;
 
         asoc = sctp_id2assoc(sk, assocparams.sasoc_assoc_id);
@@ -4671,9 +4708,11 @@ static int sctp_getsockopt_context(struct sock *sk, int len,
         struct sctp_sock *sp;
         struct sctp_association *asoc;
 
-        if (len != sizeof(struct sctp_assoc_value))
+        if (len < sizeof(struct sctp_assoc_value))
                 return -EINVAL;
 
+        len = sizeof(struct sctp_assoc_value);
+
         if (copy_from_user(&params, optval, len))
                 return -EFAULT;
 
@@ -6084,8 +6123,11 @@ static void sctp_sock_migrate(struct sock *oldsk, struct sock *newsk,
          * queued to the backlog.  This prevents a potential race between
          * backlog processing on the old socket and new-packet processing
          * on the new socket.
+         *
+         * The caller has just allocated newsk so we can guarantee that other
+         * paths won't try to lock it and then oldsk.
          */
-        sctp_lock_sock(newsk);
+        lock_sock_nested(newsk, SINGLE_DEPTH_NESTING);
         sctp_assoc_migrate(assoc, newsk);
 
         /* If the association on the newsk is already closed before accept()