linux-kernel - [PATCH linux-acpi] Fix /proc/acpi/alarm set error

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Message-Id: <1198738022.8950.3.camel@yangyi-dev.bj.intel.com>
Date:	Thu, 27 Dec 2007 14:47:02 +0800
From:	Yi Yang <yi.y.yang@...el.com>
To:	linux-acpi@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, lenb@...nel.org,
	acpi-bugzilla@...ts.sourceforge.net
Subject: [PATCH linux-acpi] Fix /proc/acpi/alarm set error

/proc/acpi/alarm can't be set correctly, here is a sample:

[root@...alhost /]# echo "2006 09" > /proc/acpi/alarm
[root@...alhost /]# cat /proc/acpi/alarm
2007-12-09 09:09:09
[root@...alhost /]# echo "2006 04" > /proc/acpi/alarm
[root@...alhost /]# cat /proc/acpi/alarm
2007-12-04 04:04:04
[root@...alhost /]#

Obviously, it is wrong, it should consider it as an invalid input.

This patch'll fix this issue, after applying this patch, the result is:

[root@...alhost /]# echo "2008 09" > /proc/acpi/alarm
-bash: echo: write error: Invalid argument
[root@...alhost /]#

Signed-off by Yi Yang <yi.y.yang@...el.com>
 
diff --git a/drivers/acpi/sleep/proc.c b/drivers/acpi/sleep/proc.c
index 1538355..fce78fb 100644
--- a/drivers/acpi/sleep/proc.c
+++ b/drivers/acpi/sleep/proc.c
@@ -178,6 +178,9 @@ static int get_date_field(char **p, u32 * value)
 	 * Try to find delimeter, only to insert null.  The end of the
 	 * string won't have one, but is still valid.
 	 */
+	if (*p == NULL)
+		return result;
+
 	next = strpbrk(*p, "- :");
 	if (next)
 		*next++ = '\0';
@@ -190,6 +193,8 @@ static int get_date_field(char **p, u32 * value)
 
 	if (next)
 		*p = next;
+	else
+		*p = NULL;
 
 	return result;
 }


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