netdev - Re: [PATCH v2 net 1/3] ipv6: prevent UAF in ip6_send

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Message-ID: <2e40c724-7a88-4271-bac5-900cd338e002@kernel.org>
Date: Tue, 20 Aug 2024 12:58:16 -0600
From: David Ahern <dsahern@...nel.org>
To: Eric Dumazet <edumazet@...gle.com>, "David S . Miller"
 <davem@...emloft.net>, Jakub Kicinski <kuba@...nel.org>,
 Paolo Abeni <pabeni@...hat.com>
Cc: netdev@...r.kernel.org, eric.dumazet@...il.com,
 syzbot <syzkaller@...glegroups.com>
Subject: Re: [PATCH v2 net 1/3] ipv6: prevent UAF in ip6_send_skb()

On 8/20/24 10:08 AM, Eric Dumazet wrote:
> syzbot reported an UAF in ip6_send_skb() [1]
> 
> After ip6_local_out() has returned, we no longer can safely
> dereference rt, unless we hold rcu_read_lock().
> 
> A similar issue has been fixed in commit
> a688caa34beb ("ipv6: take rcu lock in rawv6_send_hdrinc()")
> 
> Another potential issue in ip6_finish_output2() is handled in a
> separate patch.
> 

...

> 
> Fixes: 0625491493d9 ("ipv6: ip6_push_pending_frames() should increment IPSTATS_MIB_OUTDISCARDS")
> Signed-off-by: Eric Dumazet <edumazet@...gle.com>
> Reported-by: syzbot <syzkaller@...glegroups.com>
> ---
>  net/ipv6/ip6_output.c | 2 ++
>  1 file changed, 2 insertions(+)
> 
Reviewed-by: David Ahern <dsahern@...nel.org>