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: 493ced1a ("ipv4: Allow routes to use nexthop objects") Fixes: 6bf92d70 ("net: ipv4: fix route with nexthop object delete warning") Reported-by:Gwangun Jung <exsociety@gmail.com> Signed-off-by:
David Ahern <dsahern@kernel.org> Reviewed-by:
Ido Schimmel <idosch@nvidia.com> Tested-by:
Ido Schimmel <idosch@nvidia.com> Signed-off-by:
David S. Miller <davem@davemloft.net>
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