K 10
svn:author
V 7
dchagin
K 8
svn:date
V 27
2016-06-26T16:59:59.687809Z
K 7
svn:log
V 600
Fix a bug introduced in r283433.

[1] Remove unneeded sockaddr conversion before kern_recvit() call as the from
argument is used to record result (the source address of the received message) only.

[2] In Linux the type of msg_namelen member of struct msghdr is signed but native
msg_namelen has a unsigned type (socklen_t). So use the proper storage to fetch fromlen
from userspace and than check the user supplied value and return EINVAL if it is less
than 0 as a Linux do.

Reported by:	Thomas Mueller <tmueller at sysgo dot com> [1]
Reviewed by:	kib@
Approved by:	re (gjb, kib)
MFC after:	3 days

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