From 1ff15a710a862db1101b97810af14aedc835a86a Mon Sep 17 00:00:00 2001
From: David Ahern <dsahern@kernel.org>
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@kernel.org>
Cc: Roopa Prabhu <roopa@nvidia.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
---
net/ipv6/route.c | 6 +++++-
1 file changed, 5 insertions(+), 1 deletion(-)
diff --git a/net/ipv6/route.c b/net/ipv6/route.c
index d16599c225b87..b311c0bc9983e 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;
}
}
--
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