From: David Ahern dsahern@kernel.org
[ Upstream commit 95bdba23b5b4aa75fe3e6c84335e638641c707bb ]
As Nicolas noted, if gateway validation fails walking the multipath attribute the code should jump to the cleanup to free previously allocated memory.
Fixes: 1ff15a710a86 ("ipv6: Check attribute length for RTA_GATEWAY when deleting multipath route") Signed-off-by: David Ahern dsahern@kernel.org Acked-by: Nicolas Dichtel nicolas.dichtel@6wind.com Link: https://lore.kernel.org/r/20220103170555.94638-1-dsahern@kernel.org Signed-off-by: Jakub Kicinski kuba@kernel.org Signed-off-by: Sasha Levin sashal@kernel.org --- net/ipv6/route.c | 8 +++----- 1 file changed, 3 insertions(+), 5 deletions(-)
diff --git a/net/ipv6/route.c b/net/ipv6/route.c index 56f0783df5896..5ef6e27e026e9 100644 --- a/net/ipv6/route.c +++ b/net/ipv6/route.c @@ -5146,12 +5146,10 @@ static int ip6_route_multipath_add(struct fib6_config *cfg,
nla = nla_find(attrs, attrlen, RTA_GATEWAY); if (nla) { - int ret; - - ret = fib6_gw_from_attr(&r_cfg.fc_gateway, nla, + err = fib6_gw_from_attr(&r_cfg.fc_gateway, nla, extack); - if (ret) - return ret; + if (err) + goto cleanup;
r_cfg.fc_flags |= RTF_GATEWAY; }