netdev - [PATCH v4 3/9] brcmfmac: firmware: Do not crash on a NULL board

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Date:   Tue,  1 Feb 2022 01:07:07 +0900
From:   Hector Martin <marcan@...can.st>
To:     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>,
        Wright Feng <wright.feng@...ineon.com>,
        Dmitry Osipenko <digetx@...il.com>
Cc:     Hector Martin <marcan@...can.st>, 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,
        Arend van Spriel <arend.vanspriel@...adcom.com>,
        stable@...r.kernel.org
Subject: [PATCH v4 3/9] brcmfmac: firmware: Do not crash on a NULL board_type

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")
Reviewed-by: Arend van Spriel <arend.vanspriel@...adcom.com>
Reviewed-by: Dmitry Osipenko <digetx@...il.com>
Cc: stable@...r.kernel.org
Signed-off-by: Hector Martin <marcan@...can.st>
---
 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)
-- 
2.33.0