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gpio: mt7621: report failure of devm_kasprintf()

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[ Upstream commit 59d646c775 ]

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.

Fixes: 4ba9c3afda ("gpio: mt7621: Add a driver for MT7621")
Signed-off-by: Nicholas Mc Guire <hofrat@osadl.org>
Reviewed-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>
Acked-by: Sean Wang <sean.wang@kernel.org>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Nicholas Mc Guire
2018-11-21 19:06:12 +01:00
committed by Greg Kroah-Hartman
parent 7eff52c36c
commit 6c95c2eebe
1 changed files with 2 additions and 0 deletions
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2
drivers/gpio/gpio-mt7621.c
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@@ -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) {