netdev - Re: [PATCH net v2] net/sched: clear actions pointer in miss cookie init fail

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Date:   Mon, 17 Apr 2023 09:10:17 +0000
From:   patchwork-bot+netdevbpf@...nel.org
To:     Pedro Tammela <pctammela@...atatu.com>
Cc:     netdev@...r.kernel.org, jhs@...atatu.com, xiyou.wangcong@...il.com,
        jiri@...nulli.us, davem@...emloft.net, edumazet@...gle.com,
        kuba@...nel.org, pabeni@...hat.com, marcelo.leitner@...il.com,
        paulb@...dia.com, simon.horman@...igine.com, oswalpalash@...il.com
Subject: Re: [PATCH net v2] net/sched: clear actions pointer in miss cookie init
 fail

Hello:

This patch was applied to netdev/net.git (main)
by David S. Miller <davem@...emloft.net>:

On Sat, 15 Apr 2023 12:33:09 -0300 you wrote:
> Palash reports a UAF when using a modified version of syzkaller[1].
> 
> When 'tcf_exts_miss_cookie_base_alloc()' fails in 'tcf_exts_init_ex()'
> a call to 'tcf_exts_destroy()' is made to free up the tcf_exts
> resources.
> In flower, a call to '__fl_put()' when 'tcf_exts_init_ex()' fails is made;
> Then calling 'tcf_exts_destroy()', which triggers an UAF since the
> already freed tcf_exts action pointer is lingering in the struct.
> 
> [...]

Here is the summary with links:
  - [net,v2] net/sched: clear actions pointer in miss cookie init fail
    https://git.kernel.org/netdev/net/c/338469d677e5

You are awesome, thank you!
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