[IPV6] fix ipv6_getsockopt_sticky copy_to_user leak

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>

1 files changed, 1 insertions, 1 deletions

diff --git a/net/ipv6/ipv6_sockglue.c b/net/ipv6/ipv6_sockglue.c
index b82333b9228..f5f9582a8d3 100644
--- a/net/ipv6/ipv6_sockglue.c
+++ b/net/ipv6/ipv6_sockglue.c
@@ -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;