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[IPV6] fix ipv6_getsockopt_sticky copy_to_user leak

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User supplied len < 0 can cause leak of kernel memory.
Use unsigned compare instead.

Signed-off-by: Chris Wright <chrisw@sous-sol.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Chris Wright 2007-03-09 16:19:17 -08:00 committed by David S. Miller
parent dfee0a725b
commit d2b02ed948
1 changed files with 1 additions and 1 deletions
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2
net/ipv6/ipv6_sockglue.c
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@ -804,7 +804,7 @@ static int ipv6_getsockopt_sticky(struct sock *sk, struct ipv6_txoptions *opt,
return 0;
hdr = opt->hopopt;
len = min_t(int, len, ipv6_optlen(hdr));
len = min_t(unsigned int, len, ipv6_optlen(hdr));
if (copy_to_user(optval, hdr, ipv6_optlen(hdr)))
return -EFAULT;
return len;