netdev - Re: [PATCH net] ipv6: avoid use-after-free in ip6

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Date:   Thu, 08 Dec 2022 04:20:15 +0000
From:   patchwork-bot+netdevbpf@...nel.org
To:     Eric Dumazet <edumazet@...gle.com>
Cc:     davem@...emloft.net, kuba@...nel.org, pabeni@...hat.com,
        netdev@...r.kernel.org, eric.dumazet@...il.com,
        syzbot+8c0ac31aa9681abb9e2d@...kaller.appspotmail.com,
        weiwan@...gle.com, kafai@...com
Subject: Re: [PATCH net] ipv6: avoid use-after-free in ip6_fragment()

Hello:

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

On Tue,  6 Dec 2022 10:13:51 +0000 you wrote:
> Blamed commit claimed rcu_read_lock() was held by ip6_fragment() callers.
> 
> It seems to not be always true, at least for UDP stack.
> 
> syzbot reported:
> 
> BUG: KASAN: use-after-free in ip6_dst_idev include/net/ip6_fib.h:245 [inline]
> BUG: KASAN: use-after-free in ip6_fragment+0x2724/0x2770 net/ipv6/ip6_output.c:951
> Read of size 8 at addr ffff88801d403e80 by task syz-executor.3/7618
> 
> [...]

Here is the summary with links:
  - [net] ipv6: avoid use-after-free in ip6_fragment()
    https://git.kernel.org/netdev/net/c/803e84867de5

You are awesome, thank you!
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