linux-kernel - [PATCH] eeepc-laptop: remove possible use of uninitialized value

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Message-Id: <1409784805-14190-1-git-send-email-fransklaver@gmail.com>
Date:	Thu,  4 Sep 2014 00:53:25 +0200
From:	Frans Klaver <fransklaver@...il.com>
To:	Corentin Chary <corentin.chary@...il.com>
Cc:	Frans Klaver <fransklaver@...il.com>,
	Matthew Garrett <matthew.garrett@...ula.com>,
	acpi4asus-user@...ts.sourceforge.net,
	platform-driver-x86@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] eeepc-laptop: remove possible use of uninitialized value

In store_sys_acpi, if count equals zero, or parse_arg()s sscanf call
fails, 'value' remains possibly uninitialized. In that case 'value'
shouldn't be used to produce the store_sys_acpi()s return value.

Only test the return value of set_acpi() if we can actually call it.
Return rv otherwise.

Signed-off-by: Frans Klaver <fransklaver@...il.com>
---
 drivers/platform/x86/eeepc-laptop.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/platform/x86/eeepc-laptop.c b/drivers/platform/x86/eeepc-laptop.c
index bd533c2..41f12ba 100644
--- a/drivers/platform/x86/eeepc-laptop.c
+++ b/drivers/platform/x86/eeepc-laptop.c
@@ -279,10 +279,10 @@ static ssize_t store_sys_acpi(struct device *dev, int cm,
 	int rv, value;
 
 	rv = parse_arg(buf, count, &value);
-	if (rv > 0)
-		value = set_acpi(eeepc, cm, value);
-	if (value < 0)
-		return -EIO;
+	if (rv > 0) {
+		if (set_acpi(eeepc, cm, value) < 0)
+			return -EIO;
+	}
 	return rv;
 }
 
-- 
2.1.0

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