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From:   Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To:     linux-kernel@vger.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        stable@vger.kernel.org, Nicholas Mc Guire <hofrat@osadl.org>,
        Linus Walleij <linus.walleij@linaro.org>,
        Sasha Levin <sashal@kernel.org>
Subject: [PATCH 4.20 119/352] pinctrl: nuvoton: check for devm_kasprintf() failure
Date:   Mon, 11 Feb 2019 15:15:46 +0100
Message-Id: <20190211141853.621905595@linuxfoundation.org>
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4.20-stable review patch.  If anyone has any objections, please let me know.

------------------

[ Upstream commit 4be1eaf322f07bb9694618fd2763a3a1f0a3dd25 ]

devm_kasprintf() may return NULL on failure of internal allocation thus
the assignment to  .label  is not safe if not checked. On error
npcm7xx_gpio_of() returns negative values so -ENOMEM in the
(unlikely) failure case of devm_kasprintf() should be fine here.

Signed-off-by: Nicholas Mc Guire <hofrat@osadl.org>
Fixes: 3b588e43ee5c ("pinctrl: nuvoton: add NPCM7xx pinctrl and GPIO driver")
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/pinctrl/nuvoton/pinctrl-npcm7xx.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/pinctrl/nuvoton/pinctrl-npcm7xx.c b/drivers/pinctrl/nuvoton/pinctrl-npcm7xx.c
index 7ad50d9268aa..3bda620d18bb 100644
--- a/drivers/pinctrl/nuvoton/pinctrl-npcm7xx.c
+++ b/drivers/pinctrl/nuvoton/pinctrl-npcm7xx.c
@@ -1932,6 +1932,9 @@ static int npcm7xx_gpio_of(struct npcm7xx_pinctrl *pctrl)
 			pctrl->gpio_bank[id].gc.label =
 				devm_kasprintf(pctrl->dev, GFP_KERNEL, "%pOF",
 					       np);
+			if (pctrl->gpio_bank[id].gc.label == NULL)
+				return -ENOMEM;
+
 			pctrl->gpio_bank[id].gc.dbg_show = npcmgpio_dbg_show;
 			pctrl->gpio_bank[id].direction_input =
 				pctrl->gpio_bank[id].gc.direction_input;
-- 
2.19.1