linux-kernel - Re: [PATCH v3 1/2] ath9k: fix use-after-free in ath9k_hif_usb_rx

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Date:   Thu, 12 May 2022 09:05:13 -0700
From:   Jeff Johnson <quic_jjohnson@...cinc.com>
To:     Pavel Skripkin <paskripkin@...il.com>,
        <ath9k-devel@....qualcomm.com>, <kvalo@...nel.org>,
        <davem@...emloft.net>, <kuba@...nel.org>, <toke@...e.dk>,
        <linville@...driver.com>
CC:     <linux-wireless@...r.kernel.org>, <netdev@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>,
        <syzbot+03110230a11411024147@...kaller.appspotmail.com>,
        <syzbot+c6dde1f690b60e0b9fbe@...kaller.appspotmail.com>
Subject: Re: [PATCH v3 1/2] ath9k: fix use-after-free in ath9k_hif_usb_rx_cb

On 2/7/2022 12:24 PM, Pavel Skripkin wrote:
[...snip...]
>   
>   #ifdef CONFIG_ATH9K_HTC_DEBUGFS
> -
> -#define TX_STAT_INC(c) (hif_dev->htc_handle->drv_priv->debug.tx_stats.c++)
> -#define TX_STAT_ADD(c, a) (hif_dev->htc_handle->drv_priv->debug.tx_stats.c += a)
> -#define RX_STAT_INC(c) (hif_dev->htc_handle->drv_priv->debug.skbrx_stats.c++)
> -#define RX_STAT_ADD(c, a) (hif_dev->htc_handle->drv_priv->debug.skbrx_stats.c += a)
> +#define __STAT_SAVE(expr) (hif_dev->htc_handle->drv_priv ? (expr) : 0)
> +#define TX_STAT_INC(c) __STAT_SAVE(hif_dev->htc_handle->drv_priv->debug.tx_stats.c++)
> +#define TX_STAT_ADD(c, a) __STAT_SAVE(hif_dev->htc_handle->drv_priv->debug.tx_stats.c += a)
> +#define RX_STAT_INC(c) __STAT_SAVE(hif_dev->htc_handle->drv_priv->debug.skbrx_stats.c++)
> +#define RX_STAT_ADD(c, a) __STAT_SAVE(hif_dev->htc_handle->drv_priv->debug.skbrx_stats.c += a)

it is unfortunate that the existing macros don't abide by the coding style:
	Things to avoid when using macros:
	macros that depend on having a local variable with a magic name

the companion macros in ath9k/debug.h do the right thing

perhaps this could be given to Kernel Janitors for subsequent cleanup?