netdev - Re: [PATCH v2 net-next] bluetooth: unregister correct BTPROTO for CMTP

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Message-ID: <ZCxE2zHwezg5DyjX@corigine.com>
Date:   Tue, 4 Apr 2023 17:40:11 +0200
From:   Simon Horman <simon.horman@...igine.com>
To:     Chenyuan Mi <michenyuan@...wei.com>
Cc:     isdn@...ux-pingi.de, marcel@...tmann.org, johan.hedberg@...il.com,
        luiz.dentz@...il.com, davem@...emloft.net, edumazet@...gle.com,
        kuba@...nel.org, pabeni@...hat.com, netdev@...r.kernel.org,
        linux-bluetooth@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 net-next] bluetooth: unregister correct BTPROTO for
 CMTP

On Tue, Apr 04, 2023 at 09:52:58AM +0800, Chenyuan Mi wrote:
> On error unregister BTPROTO_CMTP to match the registration earlier in 
> the same code-path. Without this change BTPROTO_HIDP is incorrectly 
> unregistered.
> 
> This bug does not appear to cause serious security problem.
> 
> The function 'bt_sock_unregister' takes its parameter as an index and 
> NULLs the corresponding element of 'bt_proto' which is an array of 
> pointers. When 'bt_proto' dereferences each element, it would check 
> whether the element is empty or not. Therefore, the problem of null 
> pointer deference does not occur.
> 
> Found by inspection.
> 
> Fixes: 8c8de589cedd ("Bluetooth: Added /proc/net/cmtp via bt_procfs_init()")
> Signed-off-by: Chenyuan Mi <michenyuan@...wei.com>

Reviewed-by: Simon Horman <simon.horman@...igine.com>

> ---
>  net/bluetooth/cmtp/sock.c | 2 +-
>  1 files changed, 1 insertions(+), 1 deletion(-)
> 
> diff --git a/net/bluetooth/cmtp/sock.c b/net/bluetooth/cmtp/sock.c
> index 96d49d9fae96..cf4370055ce2 100644
> --- a/net/bluetooth/cmtp/sock.c
> +++ b/net/bluetooth/cmtp/sock.c
> @@ -250,7 +250,7 @@ int cmtp_init_sockets(void)
>  	err = bt_procfs_init(&init_net, "cmtp", &cmtp_sk_list, NULL);
>  	if (err < 0) {
>  		BT_ERR("Failed to create CMTP proc file");
> -		bt_sock_unregister(BTPROTO_HIDP);
> +		bt_sock_unregister(BTPROTO_CMTP);
>  		goto error;
>  	}
>  
> -- 
> 2.25.1
>