ipv6: IPV6_PKTINFO relied userspace providing correct length

Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@helsinki.fi>
Reported-by: Eric Sesterhenn <snakebyte@gmx.de>
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 eeeaad2e8b5c..40f324655e24 100644
--- a/net/ipv6/ipv6_sockglue.c
+++ b/net/ipv6/ipv6_sockglue.c
@@ -404,7 +404,7 @@ sticky_done:
                 else if (optlen < sizeof(struct in6_pktinfo) || optval == NULL)
                         goto e_inval;
 
-                if (copy_from_user(&pkt, optval, optlen)) {
+                if (copy_from_user(&pkt, optval, sizeof(struct in6_pktinfo))) {
                                 retv = -EFAULT;
                                 break;
                 }