Re: BUG: general protection fault in batadv_bla_del_backbone_claims

Which line would that be in your build?

Somehow, the bug report does not include the line number in my end.

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

Can you reproduce it with it?

Sorry. The above syzkaller reproducer needs the additional support  to run it.
But here is a C reproducer:
https://gist.github.com/freexxxyyy/0be5002c45d7f060cb599dd7595cab78

On Sun, Aug 25, 2024 at 9:24 AM Sven Eckelmann [off-list ref] wrote:

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

quoted

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:

quoted

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:

quoted

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

-- 
Yours sincerely,
Xingyu