[PATCH 065/112] ACPI : Check parameter when calling acpi_processor_get/set_throttling

Len Brown
2008-02-07T09:36:23Z

From: Zhao Yakui <yakui.zhao@intel.com>

It is necessary to check the parameter when calling the function of
acpi_processor_get/set_throttling function so as to avoid the NULL
pointer reference in pr or throttling.

http://bugzilla.kernel.org/show_bug.cgi?id=9747

Signed-off-by: Zhao Yakui <yakui.zhao@intel.com>
Signed-off-by: Len Brown <len.brown@intel.com>
---
drivers/acpi/processor_throttling.c | 15 +++++++++++++++
1 files changed, 15 insertions(+), 0 deletions(-)

diff --git a/drivers/acpi/processor_throttling.c b/drivers/acpi/processor_throttling.c
index 1685b40..5d2eae2 100644
--- a/drivers/acpi/processor_throttling.c
+++ b/drivers/acpi/processor_throttling.c
@@ -589,6 +589,11 @@ static int acpi_processor_get_throttling(struct acpi_processor *pr)
cpumask_t saved_mask;
int ret;

+ if (!pr)
+ return -EINVAL;
+
+ if (!pr->flags.throttling)
+ return -ENODEV;
/*
* Migrate task to the cpu pointed by pr.
*/
@@ -743,6 +748,16 @@ int acpi_processor_set_throttling(struct acpi_processor *pr, int state)
{
cpumask_t saved_mask;
int ret;
+
+ if (!pr)
+ return -EINVAL;
+
+ if (!pr->flags.throttling)
+ return -ENODEV;
+
+ if ((state < 0) || (state > (pr->throttling.state_count - 1)))
+ return -EINVAL;
+
/*
* Migrate task to the cpu pointed by pr.
*/
--
1.5.4.23.gef5b9