From: David Ahern <dsahern@kernel.org>
To: Eric Dumazet <edumazet@google.com>,
"David S . Miller" <davem@davemloft.net>,
Jakub Kicinski <kuba@kernel.org>, Paolo Abeni <pabeni@redhat.com>
Cc: netdev@vger.kernel.org, eric.dumazet@gmail.com
Subject: Re: [PATCH net-next] ipv6: add debug checks in fib6_info_release()
Date: Tue, 5 Dec 2023 20:41:02 -0700 [thread overview]
Message-ID: <ee557d3b-79f1-4851-9473-99f711a78f2b@kernel.org> (raw)
In-Reply-To: <20231205173250.2982846-1-edumazet@google.com>
On 12/5/23 10:32 AM, Eric Dumazet wrote:
> Some elusive syzbot reports are hinting to fib6_info_release(),
> with a potential dangling f6i->gc_link anchor.
>
> Add debug checks so that syzbot can catch the issue earlier eventually.
>
> BUG: KASAN: slab-use-after-free in __hlist_del include/linux/list.h:990 [inline]
> BUG: KASAN: slab-use-after-free in hlist_del_init include/linux/list.h:1016 [inline]
> BUG: KASAN: slab-use-after-free in fib6_clean_expires_locked include/net/ip6_fib.h:533 [inline]
> BUG: KASAN: slab-use-after-free in fib6_purge_rt+0x986/0x9c0 net/ipv6/ip6_fib.c:1064
> Write of size 8 at addr ffff88802805a840 by task syz-executor.1/10057
>
...
>
> Signed-off-by: Eric Dumazet <edumazet@google.com>
> ---
> include/net/ip6_fib.h | 5 ++++-
> 1 file changed, 4 insertions(+), 1 deletion(-)
>
Reviewed-by: David Ahern <dsahern@kernel.org>
next prev parent reply other threads:[~2023-12-06 3:41 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-12-05 17:32 [PATCH net-next] ipv6: add debug checks in fib6_info_release() Eric Dumazet
2023-12-06 3:41 ` David Ahern [this message]
2023-12-07 3:10 ` patchwork-bot+netdevbpf
2023-12-07 13:29 ` Eric Dumazet
2023-12-07 16:43 ` Kui-Feng Lee
2023-12-07 18:06 ` Kui-Feng Lee
2023-12-07 18:10 ` Eric Dumazet
2023-12-07 18:19 ` Kui-Feng Lee
2023-12-07 18:22 ` Eric Dumazet
2023-12-07 18:25 ` David Ahern
2023-12-07 18:26 ` David Ahern
2023-12-07 18:36 ` Kui-Feng Lee
2023-12-07 18:40 ` Kui-Feng Lee
2023-12-07 19:00 ` Kui-Feng Lee
2023-12-07 19:05 ` Eric Dumazet
2023-12-07 19:08 ` Kui-Feng Lee
2023-12-07 19:14 ` Eric Dumazet
2023-12-07 18:46 ` Kui-Feng Lee
2023-12-07 18:55 ` Eric Dumazet
2023-12-07 23:02 ` Kui-Feng Lee
2023-12-08 9:18 ` Eric Dumazet
2023-12-08 18:20 ` Kui-Feng Lee
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