linux-kernel - Re: [PATCH] Bluetooth: msft: fix slab-use-after-free in msft_do

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Date: Sat, 27 Apr 2024 23:47:53 -0400
From: Sungwoo Kim <iam@...g-woo.kim>
Cc: daveti@...due.edu, Marcel Holtmann <marcel@...tmann.org>, 
	Johan Hedberg <johan.hedberg@...il.com>, Luiz Augusto von Dentz <luiz.dentz@...il.com>, 
	linux-bluetooth@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] Bluetooth: msft: fix slab-use-after-free in msft_do_close()

Hello,

Could you not apply this? I found an error.

On Sat, Apr 27, 2024 at 1:19 AM Sungwoo Kim <iam@...g-woo.kim> wrote:
>
> +
> +static struct msft_data *msft_data_hold_unless_zero(struct msft_data *msft)
> +{
> +       BT_DBG("msft %p orig refcnt %u", msft, kref_read(&msft->kref));

Here, msft could be NULL. &msft->kref causes a null-ptr-deref error.
I already sent a v2 patch fixing this.

> +
> +       if (!msft)
> +               return NULL;
> +
> +       if (!kref_get_unless_zero(&msft->kref))
> +               return NULL;
> +
> +       return msft;
> +}
> +

Thanks,
Sungwoo.