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[IPV6]: Fix the data length of get destination options with short length

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If get destination options with length which is not enough for that
option,getsockopt() will still return the real length of the option,
which is larger then the buffer space.
 This is because ipv6_getsockopt_sticky() returns the real length of
the option.

This patch fix this problem.

Signed-off-by: Yang Hongyang <yanghy@cn.fujitsu.com>
Signed-off-by: YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>
This commit is contained in:
Yang Hongyang 2008-05-28 16:27:28 +08:00 committed by YOSHIFUJI Hideaki
parent 05335c2220
commit 95b496b666
1 changed files with 1 additions and 1 deletions
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2
net/ipv6/ipv6_sockglue.c
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@ -832,7 +832,7 @@ static int ipv6_getsockopt_sticky(struct sock *sk, struct ipv6_txoptions *opt,
len = min_t(unsigned int, len, ipv6_optlen(hdr)); len = min_t(unsigned int, len, ipv6_optlen(hdr));
if (copy_to_user(optval, hdr, len)) if (copy_to_user(optval, hdr, len))
return -EFAULT; return -EFAULT;
return ipv6_optlen(hdr); return len;
} }
static int do_ipv6_getsockopt(struct sock *sk, int level, int optname, static int do_ipv6_getsockopt(struct sock *sk, int level, int optname,