linux-kernel - Re: BUG: general protection fault in batadv_bla_del_backbone

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Message-ID: <13617673.uLZWGnKmhe@bentobox>
Date: Sun, 25 Aug 2024 18:23:54 +0200
From: Sven Eckelmann <sven@...fation.org>
To: mareklindner@...mailbox.ch, sw@...onwunderlich.de, a@...table.cc,
 davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org, pabeni@...hat.com,
 netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
 b.a.t.m.a.n@...ts.open-mesh.org, Xingyu Li <xli399@....edu>
Subject: Re: BUG: general protection fault in batadv_bla_del_backbone_claims

On Sunday, 25 August 2024 06:14:48 CEST Xingyu Li wrote:
> In line 307 of net/batman-adv/bridge_loop_avoidance, when executing
> "hash = backbone_gw->bat_priv->bla.claim_hash;", it does not check if
> "backbone_gw->bat_priv==NULL".

Because it cannot be NULL unless something really, really, really bad 
happened. bat_priv will only be set when the gateway gets created using 
batadv_bla_get_backbone_gw(). It never gets unset during the lifetime on the 
backbone gateway.

Maybe Simon has more to say about that.

On Sunday, 25 August 2024 06:14:48 CEST Xingyu Li wrote:
> RIP: 0010:batadv_bla_del_backbone_claims+0x4e/0x360

Which line would that be in your build?

On Sunday, 25 August 2024 06:14:48 CEST Xingyu Li wrote:
> Syzkaller reproducer:

At the moment, I am unable to reproduce this crash with the provided 
reproducer.

Can you reproduce it with it? If you can, did you try to perform a bisect 
using the reproducer?

Kind regards,
	Sven
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