linux-kernel - [PATCH 4/4] alpha: Move two assignments for the variable "res" in srm_env_proc

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Date:   Wed, 18 Jan 2017 12:50:17 +0100
From:   SF Markus Elfring <elfring@...rs.sourceforge.net>
To:     linux-alpha@...r.kernel.org, Al Viro <viro@...iv.linux.org.uk>,
        Ivan Kokshaysky <ink@...assic.park.msu.ru>,
        Jan-Benedict Glaw <jbglaw@...-owl.de>,
        Matt Turner <mattst88@...il.com>,
        Nicolas Pitre <nicolas.pitre@...aro.org>,
        Richard Cochran <richardcochran@...il.com>,
        Richard Henderson <rth@...ddle.net>,
        Thomas Gleixner <tglx@...utronix.de>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        kernel-janitors@...r.kernel.org
Subject: [PATCH 4/4] alpha: Move two assignments for the variable "res" in
 srm_env_proc_write()

From: Markus Elfring <elfring@...rs.sourceforge.net>
Date: Wed, 18 Jan 2017 12:08:44 +0100

A local variable was set to an error code in two cases before a concrete
error situation was detected. Thus move the corresponding assignment into
an if branch to indicate a software failure there.

This issue was detected by using the Coccinelle software.

Signed-off-by: Markus Elfring <elfring@...rs.sourceforge.net>
---
 arch/alpha/kernel/srm_env.c | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/arch/alpha/kernel/srm_env.c b/arch/alpha/kernel/srm_env.c
index ffe996a54fad..a5f182780578 100644
--- a/arch/alpha/kernel/srm_env.c
+++ b/arch/alpha/kernel/srm_env.c
@@ -113,13 +113,15 @@ static ssize_t srm_env_proc_write(struct file *file, const char __user *buffer,
 	if (!buf)
 		return -ENOMEM;
 
-	res = -EINVAL;
-	if (count >= PAGE_SIZE)
+	if (count >= PAGE_SIZE) {
+		res = -EINVAL;
 		goto out;
+	}
 
-	res = -EFAULT;
-	if (copy_from_user(buf, buffer, count))
+	if (copy_from_user(buf, buffer, count)) {
+		res = -EFAULT;
 		goto out;
+	}
 	buf[count] = '\0';
 
 	ret1 = callback_setenv(id, buf, count);
-- 
2.11.0