[IPV6]: Check length of optval provided by user in setsockopt().
Check length of setsockopt's optval, which provided by user, before copy it from user space. For POSIX compliant, return -EINVAL for setsockopt of short lengths. Signed-off-by:Wang Chen <wangchen@cn.fujitsu.com> Signed-off-by:
YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>
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