if (copy_from_user(kmsg, umsg, sizeof(struct msghdr)))
return -EFAULT;
+ if (kmsg->msg_name == NULL)
+ kmsg->msg_namelen = 0;
+
if (kmsg->msg_namelen < 0)
return -EINVAL;
int err, ctl_len, iov_size, total_len;
err = -EFAULT;
- if (MSG_CMSG_COMPAT & flags) {
- if (get_compat_msghdr(msg_sys, msg_compat))
- return -EFAULT;
- } else {
+ if (MSG_CMSG_COMPAT & flags)
+ err = get_compat_msghdr(msg_sys, msg_compat);
+ else
err = copy_msghdr_from_user(msg_sys, msg);
- if (err)
- return err;
- }
+ if (err)
+ return err;
/* do not move before msg_sys is valid */
err = -EMSGSIZE;
struct sockaddr __user *uaddr;
int __user *uaddr_len;
- if (MSG_CMSG_COMPAT & flags) {
- if (get_compat_msghdr(msg_sys, msg_compat))
- return -EFAULT;
- } else {
+ if (MSG_CMSG_COMPAT & flags)
+ err = get_compat_msghdr(msg_sys, msg_compat);
+ else
err = copy_msghdr_from_user(msg_sys, msg);
- if (err)
- return err;
- }
+ if (err)
+ return err;
err = -EMSGSIZE;
if (msg_sys->msg_iovlen > UIO_MAXIOV)
break;
}
-out_put:
- fput_light(sock->file, fput_needed);
-
if (err == 0)
- return datagrams;
+ goto out_put;
- if (datagrams != 0) {
+ if (datagrams == 0) {
+ datagrams = err;
+ goto out_put;
+ }
+
+ /*
+ * We may return less entries than requested (vlen) if the
+ * sock is non block and there aren't enough datagrams...
+ */
+ if (err != -EAGAIN) {
/*
- * We may return less entries than requested (vlen) if the
- * sock is non block and there aren't enough datagrams...
+ * ... or if recvmsg returns an error after we
+ * received some datagrams, where we record the
+ * error to return on the next call or if the
+ * app asks about it using getsockopt(SO_ERROR).
*/
- if (err != -EAGAIN) {
- /*
- * ... or if recvmsg returns an error after we
- * received some datagrams, where we record the
- * error to return on the next call or if the
- * app asks about it using getsockopt(SO_ERROR).
- */
- sock->sk->sk_err = -err;
- }
-
- return datagrams;
+ sock->sk->sk_err = -err;
}
+out_put:
+ fput_light(sock->file, fput_needed);
- return err;
+ return datagrams;
}
SYSCALL_DEFINE5(recvmmsg, int, fd, struct mmsghdr __user *, mmsg,