net: switch importing msghdr from userland to {compat_,}import_iovec()

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

diff --git a/include/net/compat.h b/include/net/compat.h
index 42a9c84..48103cf 100644 (file)
--- a/include/net/compat.h
+++ b/include/net/compat.h
@@ -40,7 +40,7 @@ int compat_sock_get_timestampns(struct sock *, struct timespec __user *);
 #define compat_mmsghdr mmsghdr
 #endif /* defined(CONFIG_COMPAT) */
 
-ssize_t get_compat_msghdr(struct msghdr *, struct compat_msghdr __user *,
+int get_compat_msghdr(struct msghdr *, struct compat_msghdr __user *,
                      struct sockaddr __user **, struct iovec **);
 asmlinkage long compat_sys_sendmsg(int, struct compat_msghdr __user *,
                                   unsigned int);

diff --git a/net/compat.c b/net/compat.c
index c4b6b0f..5cfd26a 100644 (file)
--- a/net/compat.c
+++ b/net/compat.c
@@ -31,10 +31,10 @@
 #include <asm/uaccess.h>
 #include <net/compat.h>
 
-ssize_t get_compat_msghdr(struct msghdr *kmsg,
-                         struct compat_msghdr __user *umsg,
-                         struct sockaddr __user **save_addr,
-                         struct iovec **iov)
+int get_compat_msghdr(struct msghdr *kmsg,
+                     struct compat_msghdr __user *umsg,
+                     struct sockaddr __user **save_addr,
+                     struct iovec **iov)
 {
        compat_uptr_t uaddr, uiov, tmp3;
        compat_size_t nr_segs;
@@ -81,13 +81,9 @@ ssize_t get_compat_msghdr(struct msghdr *kmsg,
 
        kmsg->msg_iocb = NULL;
 
-       err = compat_rw_copy_check_uvector(save_addr ? READ : WRITE,
-                                          compat_ptr(uiov), nr_segs,
-                                          UIO_FASTIOV, *iov, iov);
-       if (err >= 0)
-               iov_iter_init(&kmsg->msg_iter, save_addr ? READ : WRITE,
-                             *iov, nr_segs, err);
-       return err;
+       return compat_import_iovec(save_addr ? READ : WRITE,
+                                  compat_ptr(uiov), nr_segs,
+                                  UIO_FASTIOV, iov, &kmsg->msg_iter);
 }
 
 /* Bleech... */

diff --git a/net/socket.c b/net/socket.c
index 46f0e1d..e5669ce 100644 (file)
--- a/net/socket.c
+++ b/net/socket.c
@@ -1841,10 +1841,10 @@ struct used_address {
        unsigned int name_len;
 };
 
-static ssize_t copy_msghdr_from_user(struct msghdr *kmsg,
-                                    struct user_msghdr __user *umsg,
-                                    struct sockaddr __user **save_addr,
-                                    struct iovec **iov)
+static int copy_msghdr_from_user(struct msghdr *kmsg,
+                                struct user_msghdr __user *umsg,
+                                struct sockaddr __user **save_addr,
+                                struct iovec **iov)
 {
        struct sockaddr __user *uaddr;
        struct iovec __user *uiov;
@@ -1890,13 +1890,8 @@ static ssize_t copy_msghdr_from_user(struct msghdr *kmsg,
 
        kmsg->msg_iocb = NULL;
 
-       err = rw_copy_check_uvector(save_addr ? READ : WRITE,
-                                   uiov, nr_segs,
-                                   UIO_FASTIOV, *iov, iov);
-       if (err >= 0)
-               iov_iter_init(&kmsg->msg_iter, save_addr ? READ : WRITE,
-                             *iov, nr_segs, err);
-       return err;
+       return import_iovec(save_addr ? READ : WRITE, uiov, nr_segs,
+                           UIO_FASTIOV, iov, &kmsg->msg_iter);
 }
 
 static int ___sys_sendmsg(struct socket *sock, struct user_msghdr __user *msg,
@@ -1921,8 +1916,8 @@ static int ___sys_sendmsg(struct socket *sock, struct user_msghdr __user *msg,
        else
                err = copy_msghdr_from_user(msg_sys, msg, NULL, &iov);
        if (err < 0)
-               goto out_freeiov;
-       total_len = err;
+               return err;
+       total_len = iov_iter_count(&msg_sys->msg_iter);
 
        err = -ENOBUFS;
 
@@ -1988,8 +1983,7 @@ out_freectl:
        if (ctl_buf != ctl)
                sock_kfree_s(sock->sk, ctl_buf, ctl_len);
 out_freeiov:
-       if (iov != iovstack)
-               kfree(iov);
+       kfree(iov);
        return err;
 }
 
@@ -2114,8 +2108,8 @@ static int ___sys_recvmsg(struct socket *sock, struct user_msghdr __user *msg,
        else
                err = copy_msghdr_from_user(msg_sys, msg, &uaddr, &iov);
        if (err < 0)
-               goto out_freeiov;
-       total_len = err;
+               return err;
+       total_len = iov_iter_count(&msg_sys->msg_iter);
 
        cmsg_ptr = (unsigned long)msg_sys->msg_control;
        msg_sys->msg_flags = flags & (MSG_CMSG_CLOEXEC|MSG_CMSG_COMPAT);
@@ -2153,8 +2147,7 @@ static int ___sys_recvmsg(struct socket *sock, struct user_msghdr __user *msg,
        err = len;
 
 out_freeiov:
-       if (iov != iovstack)
-               kfree(iov);
+       kfree(iov);
        return err;
 }