The patch below does not apply to the 4.9-stable tree.
If someone wants it applied there, or to any other stable or longterm
tree, then please email the backport, including the original git commit
id to <stable@xxxxxxxxxxxxxxx>.
thanks,
greg k-h
------------------ original commit in Linus's tree ------------------
>From 1ff15a710a862db1101b97810af14aedc835a86a Mon Sep 17 00:00:00 2001
From: David Ahern <dsahern@xxxxxxxxxx>
Date: Thu, 30 Dec 2021 17:36:34 -0700
Subject: [PATCH] ipv6: Check attribute length for RTA_GATEWAY when deleting
multipath route
Make sure RTA_GATEWAY for IPv6 multipath route has enough bytes to hold
an IPv6 address.
Fixes: 6b9ea5a64ed5 ("ipv6: fix multipath route replace error recovery")
Signed-off-by: David Ahern <dsahern@xxxxxxxxxx>
Cc: Roopa Prabhu <roopa@xxxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
diff --git a/net/ipv6/route.c b/net/ipv6/route.c
index d16599c225b8..b311c0bc9983 100644
--- a/net/ipv6/route.c
+++ b/net/ipv6/route.c
@@ -5453,7 +5453,11 @@ 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;
}
}
