netdev - Re: [PATCH net] ipv6: avoid lockdep issue in fib6

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Message-Id: <20200908.195725.1372066279904059904.davem@davemloft.net>
Date:   Tue, 08 Sep 2020 19:57:25 -0700 (PDT)
From:   David Miller <davem@...emloft.net>
To:     edumazet@...gle.com
Cc:     netdev@...r.kernel.org, eric.dumazet@...il.com, dsahern@...il.com
Subject: Re: [PATCH net] ipv6: avoid lockdep issue in fib6_del()

From: Eric Dumazet <edumazet@...gle.com>
Date: Tue,  8 Sep 2020 01:20:23 -0700

> syzbot reported twice a lockdep issue in fib6_del() [1]
> which I think is caused by net->ipv6.fib6_null_entry
> having a NULL fib6_table pointer.
> 
> fib6_del() already checks for fib6_null_entry special
> case, we only need to return earlier.
> 
> Bug seems to occur very rarely, I have thus chosen
> a 'bug origin' that makes backports not too complex.
 ...
> Fixes: 421842edeaf6 ("net/ipv6: Add fib6_null_entry")
> Signed-off-by: Eric Dumazet <edumazet@...gle.com>

Applied and queued up for -stable, thanks Eric.