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>
diff --git a/net/ipv6/ipv6_sockglue.c b/net/ipv6/ipv6_sockglue.c
index eeeaad2..40f3246 100644
--- a/net/ipv6/ipv6_sockglue.c
+++ b/net/ipv6/ipv6_sockglue.c
@@ -404,7 +404,7 @@
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;
}