From: Axel Lin Date: Mon, 28 Jun 2010 01:30:45 +0000 (+0800) Subject: wmi: fix a memory leak in wmi_notify_debug X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=1492616a434dae1908d0da2d6ee6605ca5a77e6f;p=GitHub%2FLineageOS%2FG12%2Fandroid_kernel_amlogic_linux-4.9.git wmi: fix a memory leak in wmi_notify_debug 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 Acked-by: Thomas Renninger Signed-off-by: Matthew Garrett --- diff --git a/drivers/platform/x86/wmi.c b/drivers/platform/x86/wmi.c index 582b5cdd3f43..6c15720be6a4 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); } /**