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From: Axel Lin on 27 Jun 2010 21:30
When acpi_evaluate_object() is passed ACPI_ALLOCATE_BUFFER,
the caller must kfree the returned buffer if AE_OK is returned.

The callers of wmi_get_event_data() pass ACPI_ALLOCATE_BUFFER,
and thus must check its return value before accessing
or kfree() on the buffer.

This patch adds return value checking for wmi_get_event_data()
and adds a missing kfree(obj) in the end of wmi_notify_debug

Signed-off-by: Axel Lin <axel.lin(a)gmail.com>
---
drivers/platform/x86/wmi.c | 8 +++++++-
1 files changed, 7 insertions(+), 1 deletions(-)

diff --git a/drivers/platform/x86/wmi.c b/drivers/platform/x86/wmi.c
index e4eaa14..5bb0ae1 100644
--- a/drivers/platform/x86/wmi.c
+++ b/drivers/platform/x86/wmi.c
@@ -518,8 +518,13 @@ static void wmi_notify_debug(u32 value, void *context)
{
struct acpi_buffer response = { ACPI_ALLOCATE_BUFFER, NULL };
union acpi_object *obj;
+ acpi_status status;

- wmi_get_event_data(value, &response);
+ status = wmi_get_event_data(value, &response);
+ if (status != AE_OK) {
+ printk(KERN_INFO "wmi: bad event status 0x%x\n", status);
+ return;
+ }

obj = (union acpi_object *)response.pointer;

@@ -543,6 +548,7 @@ static void wmi_notify_debug(u32 value, void *context)
default:
printk("object type 0x%X\n", obj->type);
}
+ kfree(obj);
}

/**
--
1.5.4.3



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