linux-kernel - [PATCH] spi: bcm2835: add a sentinel at the end of the lookup array

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Message-Id: <20231004183906.97845-1-brgl@bgdev.pl>
Date:   Wed,  4 Oct 2023 20:39:06 +0200
From:   Bartosz Golaszewski <brgl@...ev.pl>
To:     Mark Brown <broonie@...nel.org>,
        Florian Fainelli <florian.fainelli@...adcom.com>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Linus Walleij <linus.walleij@...aro.org>,
        Ray Jui <rjui@...adcom.com>,
        Scott Branden <sbranden@...adcom.com>
Cc:     Broadcom internal kernel review list 
        <bcm-kernel-feedback-list@...adcom.com>, linux-spi@...r.kernel.org,
        linux-rpi-kernel@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-gpio@...r.kernel.org,
        Bartosz Golaszewski <bartosz.golaszewski@...aro.org>,
        Hans de Goede <hdegoede@...hat.com>
Subject: [PATCH] spi: bcm2835: add a sentinel at the end of the lookup array

From: Bartosz Golaszewski <bartosz.golaszewski@...aro.org>

GPIOLIB expects the array of lookup entries to be terminated with an
empty member. We need to increase the size of the variable length array
in the lookup table by 1.

Fixes: 21f252cd29f0 ("spi: bcm2835: reduce the abuse of the GPIO API")
Reported-by: Hans de Goede <hdegoede@...hat.com>
Closes: https://lore.kernel.org/lkml/29764d46-8d3d-9794-bbde-d7928a91cbb5@redhat.com/
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@...aro.org>
---
 drivers/spi/spi-bcm2835.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/spi/spi-bcm2835.c b/drivers/spi/spi-bcm2835.c
index c9078fee3662..e709887eb2a9 100644
--- a/drivers/spi/spi-bcm2835.c
+++ b/drivers/spi/spi-bcm2835.c
@@ -1299,7 +1299,7 @@ static int bcm2835_spi_setup(struct spi_device *spi)
 	 * More on the problem that it addresses:
 	 *   https://www.spinics.net/lists/linux-gpio/msg36218.html
 	 */
-	lookup = kzalloc(struct_size(lookup, table, 1), GFP_KERNEL);
+	lookup = kzalloc(struct_size(lookup, table, 2), GFP_KERNEL);
 	if (!lookup) {
 		ret = -ENOMEM;
 		goto err_cleanup;
-- 
2.39.2