linux-kernel - [PATCH] powerpc/83xx: Add a null pointer check to mcu_gpiochip

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Message-Id: <20240115094330.33014-1-chentao@kylinos.cn>
Date: Mon, 15 Jan 2024 17:43:30 +0800
From: Kunwu Chan <chentao@...inos.cn>
To: christophe.leroy@...roup.eu,
	mpe@...erman.id.au,
	npiggin@...il.com,
	aneesh.kumar@...nel.org,
	naveen.n.rao@...ux.ibm.com
Cc: linuxppc-dev@...ts.ozlabs.org,
	linux-kernel@...r.kernel.org,
	Kunwu Chan <chentao@...inos.cn>,
	Kunwu Chan <kunwu.chan@...mail.com>
Subject: [PATCH] powerpc/83xx: Add a null pointer check to mcu_gpiochip_add

kasprintf() returns a pointer to dynamically allocated memory
which can be NULL upon failure. Ensure the allocation was successful
by checking the pointer validity.

Cc: Kunwu Chan <kunwu.chan@...mail.com>
Signed-off-by: Kunwu Chan <chentao@...inos.cn>
---
 arch/powerpc/platforms/83xx/mcu_mpc8349emitx.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/arch/powerpc/platforms/83xx/mcu_mpc8349emitx.c b/arch/powerpc/platforms/83xx/mcu_mpc8349emitx.c
index 4d8fa9ed1a67..d1ae66eaa687 100644
--- a/arch/powerpc/platforms/83xx/mcu_mpc8349emitx.c
+++ b/arch/powerpc/platforms/83xx/mcu_mpc8349emitx.c
@@ -120,6 +120,8 @@ static int mcu_gpiochip_add(struct mcu *mcu)
 
 	gc->owner = THIS_MODULE;
 	gc->label = kasprintf(GFP_KERNEL, "%pfw", dev_fwnode(dev));
+	if (!gc->label)
+		return -ENOMEM;
 	gc->can_sleep = 1;
 	gc->ngpio = MCU_NUM_GPIO;
 	gc->base = -1;
-- 
2.39.2