netdev - Re: [PATCH net-next] ipv6: add debug checks in fib6_info

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Date: Thu, 07 Dec 2023 03:10:24 +0000
From: patchwork-bot+netdevbpf@...nel.org
To: Eric Dumazet <edumazet@...gle.com>
Cc: davem@...emloft.net, kuba@...nel.org, pabeni@...hat.com,
 dsahern@...nel.org, netdev@...r.kernel.org, eric.dumazet@...il.com
Subject: Re: [PATCH net-next] ipv6: add debug checks in fib6_info_release()

Hello:

This patch was applied to netdev/net-next.git (main)
by Jakub Kicinski <kuba@...nel.org>:

On Tue,  5 Dec 2023 17:32:50 +0000 you 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
> 
> [...]

Here is the summary with links:
  - [net-next] ipv6: add debug checks in fib6_info_release()
    https://git.kernel.org/netdev/net-next/c/5a08d0065a91

You are awesome, thank you!
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