From: David Howells <dhowells@redhat.com>
Date: Wed, 20 Aug 2008 23:37:26 +0000 (-0700)
Subject: clocksource: check range
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=ee974e01e5ef2914036f08c8e41d1a3fa8bfc9d9;p=linux-beck.git

clocksource: check range

Check that the value being passed to parse_pmtmr() does not exceed the
limits of pmtmr_ioport.

Signed-off-by: David Howells <dhowells@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
---

diff --git a/drivers/clocksource/acpi_pm.c b/drivers/clocksource/acpi_pm.c
index 5ca1d80de182..3df338481004 100644
--- a/drivers/clocksource/acpi_pm.c
+++ b/drivers/clocksource/acpi_pm.c
@@ -226,9 +226,12 @@ static int __init parse_pmtmr(char *arg)
 
 	if (strict_strtoul(arg, 16, &base))
 		return -EINVAL;
-
+#ifdef CONFIG_X86_64
+	if (base > UINT_MAX)
+		return -ERANGE;
+#endif
 	printk(KERN_INFO "PMTMR IOPort override: 0x%04x -> 0x%04lx\n",
-	       (unsigned int)pmtmr_ioport, base);
+	       pmtmr_ioport, base);
 	pmtmr_ioport = base;
 
 	return 1;