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Subject: Re: [PATCH net] rxrpc: Fix local refcounting
To:     David Howells <dhowells@redhat.com>, netdev@vger.kernel.org
Cc:     linux-afs@lists.infradead.org, linux-kernel@vger.kernel.org
References: <156538726702.16201.13552536596121161945.stgit@warthog.procyon.org.uk>
From:   Jeffrey E Altman <jaltman@auristor.com>
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Organization: AuriStor, Inc.
Message-ID: <f37b4a68-1831-ed8b-d912-4bc46851a0a4@auristor.com>
Date:   Fri, 9 Aug 2019 18:34:36 -0400
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David,

Looks good to me.

You can add a Reviewed-by line.

Thanks.

Jeffrey Altman

On 8/9/2019 5:47 PM, David Howells wrote:
> Fix rxrpc_unuse_local() to handle a NULL local pointer as it can be cal=
led
> on an unbound socket on which rx->local is not yet set.
>=20
> The following reproduced (includes omitted):
>=20
> 	int main(void)
> 	{
> 		socket(AF_RXRPC, SOCK_DGRAM, AF_INET);
> 		return 0;
> 	}
>=20
> causes the following oops to occur:
>=20
> 	BUG: kernel NULL pointer dereference, address: 0000000000000010
> 	...
> 	RIP: 0010:rxrpc_unuse_local+0x8/0x1b
> 	...
> 	Call Trace:
> 	 rxrpc_release+0x2b5/0x338
> 	 __sock_release+0x37/0xa1
> 	 sock_close+0x14/0x17
> 	 __fput+0x115/0x1e9
> 	 task_work_run+0x72/0x98
> 	 do_exit+0x51b/0xa7a
> 	 ? __context_tracking_exit+0x4e/0x10e
> 	 do_group_exit+0xab/0xab
> 	 __x64_sys_exit_group+0x14/0x17
> 	 do_syscall_64+0x89/0x1d4
> 	 entry_SYSCALL_64_after_hwframe+0x49/0xbe
>=20
> Reported-by: syzbot+20dee719a2e090427b5f@syzkaller.appspotmail.com
> Fixes: 730c5fd42c1e ("rxrpc: Fix local endpoint refcounting")
> Signed-off-by: David Howells <dhowells@redhat.com>
> cc: Jeffrey Altman <jaltman@auristor.com>
> ---
>=20
>  net/rxrpc/local_object.c |   12 +++++++-----
>  1 file changed, 7 insertions(+), 5 deletions(-)
>=20
> diff --git a/net/rxrpc/local_object.c b/net/rxrpc/local_object.c
> index 9798159ee65f..c9db3e762d8d 100644
> --- a/net/rxrpc/local_object.c
> +++ b/net/rxrpc/local_object.c
> @@ -402,11 +402,13 @@ void rxrpc_unuse_local(struct rxrpc_local *local)=

>  {
>  	unsigned int au;
> =20
> -	au =3D atomic_dec_return(&local->active_users);
> -	if (au =3D=3D 0)
> -		rxrpc_queue_local(local);
> -	else
> -		rxrpc_put_local(local);
> +	if (local) {
> +		au =3D atomic_dec_return(&local->active_users);
> +		if (au =3D=3D 0)
> +			rxrpc_queue_local(local);
> +		else
> +			rxrpc_put_local(local);
> +	}
>  }
> =20
>  /*
>=20

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fn:Jeffrey Altman
n:Altman;Jeffrey
org:AuriStor, Inc.
adr:;;255 W 94TH ST STE 6B;New York;NY;10025-6985;United States
email;internet:jaltman@auristor.com
title:CEO
tel;work:+1-212-769-9018
url:https://www.linkedin.com/in/jeffreyaltman/
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