linux-kernel - [PATCH] powerpc/rtas_flash: Move an assignment for the variable "rc" in manage_flash

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Date:   Thu, 19 Jan 2017 21:33:14 +0100
From:   SF Markus Elfring <elfring@...rs.sourceforge.net>
To:     linuxppc-dev@...ts.ozlabs.org,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Michael Ellerman <mpe@...erman.id.au>,
        Paul Mackerras <paulus@...ba.org>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        kernel-janitors@...r.kernel.org
Subject: [PATCH] powerpc/rtas_flash: Move an assignment for the variable "rc"
 in manage_flash_write()

From: Markus Elfring <elfring@...rs.sourceforge.net>
Date: Thu, 19 Jan 2017 21:20:09 +0100

A local variable was set to an error code 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/powerpc/kernel/rtas_flash.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/arch/powerpc/kernel/rtas_flash.c b/arch/powerpc/kernel/rtas_flash.c
index db2b482af658..663904beff67 100644
--- a/arch/powerpc/kernel/rtas_flash.c
+++ b/arch/powerpc/kernel/rtas_flash.c
@@ -419,9 +419,10 @@ static ssize_t manage_flash_write(struct file *file, const char __user *buf,
 	op = -1;
 	if (buf) {
 		if (count > 9) count = 9;
-		rc = -EFAULT;
-		if (copy_from_user (stkbuf, buf, count))
+		if (copy_from_user(stkbuf, buf, count)) {
+			rc = -EFAULT;
 			goto error;
+		}
 		if (strncmp(stkbuf, reject_str, strlen(reject_str)) == 0) 
 			op = RTAS_REJECT_TMP_IMG;
 		else if (strncmp(stkbuf, commit_str, strlen(commit_str)) == 0) 
-- 
2.11.0