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Date: Wed, 5 Oct 2022 12:12:57 -0600 From: David Ahern <dsahern@...nel.org> To: kuba@...nel.org, davem@...emloft.net, pabeni@...hat.com Cc: netdev@...r.kernel.org, idosch@...sch.org, David Ahern <dsahern@...nel.org>, Gwangun Jung <exsociety@...il.com> Subject: [PATCH net] ipv4: Handle attempt to delete multipath route when fib_info contains an nh reference Gwangun Jung reported a slab-out-of-bounds access in fib_nh_match: fib_nh_match+0xf98/0x1130 linux-6.0-rc7/net/ipv4/fib_semantics.c:961 fib_table_delete+0x5f3/0xa40 linux-6.0-rc7/net/ipv4/fib_trie.c:1753 inet_rtm_delroute+0x2b3/0x380 linux-6.0-rc7/net/ipv4/fib_frontend.c:874 Separate nexthop objects are mutually exclusive with the legacy multipath spec. Fix fib_nh_match to return if the config for the to be deleted route contains a multipath spec while the fib_info is using a nexthop object. Fixes: 493ced1ac47c ("ipv4: Allow routes to use nexthop objects") Reported-by: Gwangun Jung <exsociety@...il.com> Signed-off-by: David Ahern <dsahern@...nel.org> --- net/ipv4/fib_semantics.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/net/ipv4/fib_semantics.c b/net/ipv4/fib_semantics.c index 2dc97583d279..17caa73f57e6 100644 --- a/net/ipv4/fib_semantics.c +++ b/net/ipv4/fib_semantics.c @@ -926,6 +926,10 @@ int fib_nh_match(struct net *net, struct fib_config *cfg, struct fib_info *fi, if (!cfg->fc_mp) return 0; + /* multipath spec and nexthop id are mutually exclusive */ + if (fi->nh) + return 1; + rtnh = cfg->fc_mp; remaining = cfg->fc_mp_len; -- 2.25.1
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