linux-kernel - [PATCH v3] gpio: fix uninit-value in swnode_find

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Message-Id: <20241026090642.28633-1-surajsonawane0215@gmail.com>
Date: Sat, 26 Oct 2024 14:36:42 +0530
From: Suraj Sonawane <surajsonawane0215@...il.com>
To: surajsonawane0215@...il.com
Cc: brgl@...ev.pl,
	linus.walleij@...aro.org,
	linux-gpio@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH v3] gpio: fix uninit-value in swnode_find_gpio

Fix an issue detected by the Smatch tool:

drivers/gpio/gpiolib-swnode.c:78 swnode_find_gpio() error:
uninitialized symbol 'ret'.

The issue occurs because the 'ret' variable may be used without
initialization if the for_each_gpio_property_name loop does not run.
This could lead to returning an undefined value, causing unpredictable
behavior.

Initialize 'ret' to 0 before the loop to ensure the function
returns an error code if no properties are parsed, maintaining proper
error handling.

Fixes: 9e4c6c1ad ("Merge tag 'io_uring-6.12-20241011' of git://git.kernel.dk/linux")
Signed-off-by: Suraj Sonawane <surajsonawane0215@...il.com>
---
V1: https://lore.kernel.org/lkml/20241022194624.34223-1-surajsonawane0215@gmail.com/T/#u 
V2: Improved commit message.
V3: Add fixes tag.

 drivers/gpio/gpiolib-swnode.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpio/gpiolib-swnode.c b/drivers/gpio/gpiolib-swnode.c
index 2b2dd7e92..51d2475c0 100644
--- a/drivers/gpio/gpiolib-swnode.c
+++ b/drivers/gpio/gpiolib-swnode.c
@@ -64,7 +64,7 @@ struct gpio_desc *swnode_find_gpio(struct fwnode_handle *fwnode,
 	struct fwnode_reference_args args;
 	struct gpio_desc *desc;
 	char propname[32]; /* 32 is max size of property name */
-	int ret;
+	int ret = 0;
 
 	swnode = to_software_node(fwnode);
 	if (!swnode)
-- 
2.34.1