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Date:   Thu, 6 Oct 2022 23:29:18 +0300
From:   Ido Schimmel <>
To:     David Ahern <>
Cc:,,,, Gwangun Jung <>
Subject: Re: [PATCH v3 net] ipv4: Handle attempt to delete multipath route
 when fib_info contains an nh reference

On Thu, Oct 06, 2022 at 10:48:49AM -0600, David Ahern wrote:
> 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")
> Fixes: 6bf92d70e690 ("net: ipv4: fix route with nexthop object delete warning")
> Reported-by: Gwangun Jung <>
> Signed-off-by: David Ahern <>

Reviewed-by: Ido Schimmel <>
Tested-by: Ido Schimmel <>

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