linux-kernel - [PATCH v2] i2c-core: One function call less in acpi_i2c_space

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Message-ID: <567E3CF3.10606@users.sourceforge.net>
Date:	Sat, 26 Dec 2015 08:08:35 +0100
From:	SF Markus Elfring <elfring@...rs.sourceforge.net>
To:	linux-i2c@...r.kernel.org, Wolfram Sang <wsa@...-dreams.de>
Cc:	kbuild-all@...org, LKML <linux-kernel@...r.kernel.org>,
	kernel-janitors@...r.kernel.org,
	Julia Lawall <julia.lawall@...6.fr>
Subject: [PATCH v2] i2c-core: One function call less in
 acpi_i2c_space_handler() after error detection

From: Markus Elfring <elfring@...rs.sourceforge.net>
Date: Sat, 26 Dec 2015 08:00:52 +0100

The kfree() function was called in one case by the
acpi_i2c_space_handler() function during error handling
even if the passed variable "client" contained a null pointer.

Implementation details could be improved by the adjustment of jump targets
according to the Linux coding style convention.

This issue was detected by using the Coccinelle software.

Signed-off-by: Markus Elfring <elfring@...rs.sourceforge.net>
---
 drivers/i2c/i2c-core.c | 12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

diff --git a/drivers/i2c/i2c-core.c b/drivers/i2c/i2c-core.c
index 7349b00..9996531 100644
--- a/drivers/i2c/i2c-core.c
+++ b/drivers/i2c/i2c-core.c
@@ -313,18 +313,18 @@ acpi_i2c_space_handler(u32 function, acpi_physical_address command,
 	client = kzalloc(sizeof(*client), GFP_KERNEL);
 	if (!client) {
 		ret = AE_NO_MEMORY;
-		goto err;
+		goto free_ares;
 	}
 
 	if (!value64 || ares->type != ACPI_RESOURCE_TYPE_SERIAL_BUS) {
 		ret = AE_BAD_PARAMETER;
-		goto err;
+		goto free_client;
 	}
 
 	sb = &ares->data.i2c_serial_bus;
 	if (sb->type != ACPI_RESOURCE_SERIAL_TYPE_I2C) {
 		ret = AE_BAD_PARAMETER;
-		goto err;
+		goto free_client;
 	}
 
 	client->adapter = adapter;
@@ -401,13 +401,13 @@ acpi_i2c_space_handler(u32 function, acpi_physical_address command,
 	default:
 		pr_info("protocol(0x%02x) is not supported.\n", accessor_type);
 		ret = AE_BAD_PARAMETER;
-		goto err;
+		goto free_client;
 	}
 
 	gsb->status = status;
-
- err:
+free_client:
 	kfree(client);
+free_ares:
 	ACPI_FREE(ares);
 	return ret;
 }
-- 
2.6.3

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