netdev - Re: [PATCH v3 3/9] brcmfmac: firmware: Do not crash on a NULL board

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Date:   Thu, 20 Jan 2022 01:02:11 +0300
From:   Dmitry Osipenko <digetx@...il.com>
To:     Hector Martin <marcan@...can.st>,
        Kalle Valo <kvalo@...eaurora.org>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Len Brown <lenb@...nel.org>,
        Arend van Spriel <aspriel@...il.com>,
        Franky Lin <franky.lin@...adcom.com>,
        Hante Meuleman <hante.meuleman@...adcom.com>,
        Chi-hsien Lin <chi-hsien.lin@...ineon.com>,
        Wright Feng <wright.feng@...ineon.com>
Cc:     Sven Peter <sven@...npeter.dev>,
        Alyssa Rosenzweig <alyssa@...enzweig.io>,
        Mark Kettenis <kettenis@...nbsd.org>,
        Rafał Miłecki <zajec5@...il.com>,
        Pieter-Paul Giesberts <pieter-paul.giesberts@...adcom.com>,
        Linus Walleij <linus.walleij@...aro.org>,
        Hans de Goede <hdegoede@...hat.com>,
        "John W. Linville" <linville@...driver.com>,
        "brian m. carlson" <sandals@...stytoothpaste.net>,
        Andy Shevchenko <andy.shevchenko@...il.com>,
        linux-wireless@...r.kernel.org, netdev@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-acpi@...r.kernel.org, brcm80211-dev-list.pdl@...adcom.com,
        SHA-cyfmac-dev-list@...ineon.com
Subject: Re: [PATCH v3 3/9] brcmfmac: firmware: Do not crash on a NULL
 board_type

17.01.2022 17:29, Hector Martin пишет:
> This unbreaks support for USB devices, which do not have a board_type
> to create an alt_path out of and thus were running into a NULL
> dereference.
> 
> Fixes: 5ff013914c62 ("brcmfmac: firmware: Allow per-board firmware binaries")
> Signed-off-by: Hector Martin <marcan@...can.st>

Technically, all patches that are intended to be included into next
stable kernel update require the "Cc: stable@...r.kernel.org" tag.

In practice such patches usually auto-picked by the patch bot, so no
need to resend.

> ---
>  drivers/net/wireless/broadcom/brcm80211/brcmfmac/firmware.c | 3 +++
>  1 file changed, 3 insertions(+)
> 
> diff --git a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/firmware.c b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/firmware.c
> index 1001c8888bfe..63821856bbe1 100644
> --- a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/firmware.c
> +++ b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/firmware.c
> @@ -599,6 +599,9 @@ static char *brcm_alt_fw_path(const char *path, const char *board_type)
>  	char alt_path[BRCMF_FW_NAME_LEN];
>  	char suffix[5];
>  
> +	if (!board_type)
> +		return NULL;
> +
>  	strscpy(alt_path, path, BRCMF_FW_NAME_LEN);
>  	/* At least one character + suffix */
>  	if (strlen(alt_path) < 5)

Good catch!

Reviewed-by: Dmitry Osipenko <digetx@...il.com>