[PATCH 1/2] gpio: mt7621: report failure of devm_kasprintf()

From: Nicholas Mc Guire
Date: Wed Nov 21 2018 - 13:13:37 EST


kasprintf() may return NULL on failure of internal allocation thus the
assigned label is not safe if not explicitly checked. On error
mediatek_gpio_bank_probe() returns negative values so -ENOMEM in the
(unlikely) failure case should be fine here.

Signed-off-by: Nicholas Mc Guire <hofrat@xxxxxxxxx>
Fixes: 4ba9c3afda41 ("gpio: mt7621: Add a driver for MT7621")
---

V2: The dev_err() for the unlikely case of the devm_kasprintf()
failing was removed on request from Bartosz Golaszewski
<bgolaszewski@xxxxxxxxxxxx>

Problem located with experimental coccinelle script

Patch was compile tested with: omega2p_defconfig, SOC_MT7621=y,
GPIOLIB=y, GPIO_MT7621=y

Patch is against 4.20-rc3 (localversion-next is next-20181121)

drivers/gpio/gpio-mt7621.c | 2 ++
1 file changed, 2 insertions(+)

diff --git a/drivers/gpio/gpio-mt7621.c b/drivers/gpio/gpio-mt7621.c
index d72af6f..1ec95bc 100644
--- a/drivers/gpio/gpio-mt7621.c
+++ b/drivers/gpio/gpio-mt7621.c
@@ -244,6 +244,8 @@ mediatek_gpio_bank_probe(struct device *dev,
rg->chip.of_xlate = mediatek_gpio_xlate;
rg->chip.label = devm_kasprintf(dev, GFP_KERNEL, "%s-bank%d",
dev_name(dev), bank);
+ if (!rg->chip.label)
+ return -ENOMEM;

ret = devm_gpiochip_add_data(dev, &rg->chip, mtk);
if (ret < 0) {
--
2.1.4