ipv6: Check attribute length for RTA_GATEWAY when deleting multipath …

…route commit 1ff15a710a862db1101b97810af14aedc835a86a upstream. Make sure RTA_GATEWAY for IPv6 multipath route has enough bytes to hold an IPv6 address. Fixes: 6b9ea5a ("ipv6: fix multipath route replace error recovery") Signed-off-by: David Ahern <[email protected]> Cc: Roopa Prabhu <[email protected]> Signed-off-by: David S. Miller <[email protected]> Signed-off-by: Greg Kroah-Hartman <[email protected]>
akeromi · Jan 11, 2022 · e30dead · e30dead
1 parent 44c90b4
commit e30dead
Showing 1 changed file with 5 additions and 1 deletion.
diff --git a/net/ipv6/route.c b/net/ipv6/route.c
@@ -4606,7 +4606,11 @@ static int ip6_route_multipath_del(struct fib6_config *cfg,
 
 			nla = nla_find(attrs, attrlen, RTA_GATEWAY);
 			if (nla) {
-				nla_memcpy(&r_cfg.fc_gateway, nla, 16);
+				err = fib6_gw_from_attr(&r_cfg.fc_gateway, nla,
+							extack);
+				if (err)
+					return err;
+
 				r_cfg.fc_flags |= RTF_GATEWAY;
 			}
 		}