tree fadca5b01e5029eaef277f691c9f4d78a54c0bad
parent 4bed72e4f5502ea3322f0a00794815fa58951abe
author Yang Hongyang <yanghy@cn.fujitsu.com> 1211963027 +0800
committer YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org> 1212606154 +0900

[IPV6]: Fix the return value of get destination options with NULL data pointer

If we pass NULL data buffer to getsockopt(), it will return 0,
and the option length is set to -EFAULT:
    getsockopt(sk, IPPROTO_IPV6, IPV6_DSTOPTS, NULL, &len);

This is because ipv6_getsockopt_sticky() will return -EFAULT or
-EINVAL if some error occur.

This patch fix this problem.

Signed-off-by: Yang Hongyang <yanghy@cn.fujitsu.com>
Signed-off-by: YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>