[PATCH 02/51] sctp: pass a kernel pointer to sctp_setsockopt_bindx

[Christoph Hellwig]

Rename sctp_setsockopt_bindx_kernel back to sctp_setsockopt_bindx,
and use the kernel pointer that sctp_setsockopt has available instead of
directly handling the user pointer in the old sctp_setsockopt_bindx.

Signed-off-by: Christoph Hellwig <h...@lst.de>
---
 net/sctp/socket.c | 33 ++++++++-------------------------
 1 file changed, 8 insertions(+), 25 deletions(-)

diff --git a/net/sctp/socket.c b/net/sctp/socket.c
index af1ebc8313d303..85ba5155b177b1 100644
--- a/net/sctp/socket.c
+++ b/net/sctp/socket.c
@@ -979,9 +979,8 @@ int sctp_asconf_mgmt(struct sctp_sock *sp, struct 
sctp_sockaddr_entry *addrw)
  *
  * Returns 0 if ok, <0 errno code on error.
  */
-static int sctp_setsockopt_bindx_kernel(struct sock *sk,
-                                       struct sockaddr *addrs, int addrs_size,
-                                       int op)
+static int sctp_setsockopt_bindx(struct sock *sk, struct sockaddr *addrs,
+                                int addrs_size, int op)
 {
        int err;
        int addrcnt = 0;
@@ -991,7 +990,7 @@ static int sctp_setsockopt_bindx_kernel(struct sock *sk,
        struct sctp_af *af;
 
        pr_debug("%s: sk:%p addrs:%p addrs_size:%d opt:%d\n",
-                __func__, sk, addrs, addrs_size, op);
+                __func__, sk, addr_buf, addrs_size, op);
 
        if (unlikely(addrs_size <= 0))
                return -EINVAL;
@@ -1037,29 +1036,13 @@ static int sctp_setsockopt_bindx_kernel(struct sock *sk,
        }
 }
 
-static int sctp_setsockopt_bindx(struct sock *sk,
-                                struct sockaddr __user *addrs,
-                                int addrs_size, int op)
-{
-       struct sockaddr *kaddrs;
-       int err;
-
-       kaddrs = memdup_user(addrs, addrs_size);
-       if (IS_ERR(kaddrs))
-               return PTR_ERR(kaddrs);
-       err = sctp_setsockopt_bindx_kernel(sk, kaddrs, addrs_size, op);
-       kfree(kaddrs);
-       return err;
-}
-
 static int sctp_bind_add(struct sock *sk, struct sockaddr *addrs,
                int addrlen)
 {
        int err;
 
        lock_sock(sk);
-       err = sctp_setsockopt_bindx_kernel(sk, addrs, addrlen,
-                                          SCTP_BINDX_ADD_ADDR);
+       err = sctp_setsockopt_bindx(sk, addrs, addrlen, SCTP_BINDX_ADD_ADDR);
        release_sock(sk);
        return err;
 }
@@ -4705,14 +4688,14 @@ static int sctp_setsockopt(struct sock *sk, int level, 
int optname,
        switch (optname) {
        case SCTP_SOCKOPT_BINDX_ADD:
                /* 'optlen' is the size of the addresses buffer. */
-               retval = sctp_setsockopt_bindx(sk, (struct sockaddr __user 
*)optval,
-                                              optlen, SCTP_BINDX_ADD_ADDR);
+               retval = sctp_setsockopt_bindx(sk, kopt, 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,
-                                              optlen, SCTP_BINDX_REM_ADDR);
+               retval = sctp_setsockopt_bindx(sk, kopt, optlen,
+                                              SCTP_BINDX_REM_ADDR);
                break;
 
        case SCTP_SOCKOPT_CONNECTX_OLD:
-- 
2.27.0