acer-wmi: fix memory leaks in WMID_set_capabilities and get_wmid_devices
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_query_block() pass ACPI_ALLOCATE_BUFFER, and thus must
check its return value before accessing or kfree() on the buffer.
This patch adds a missing kfree(out.pointer) before exit
WMID_set_capabilities() and get_wmid_devices().
Signed-off-by: Axel Lin <axel.lin@gmail.com>
Acked-by: Carlos Corbacho <carlos@strangeworlds.co.uk>
Cc: Matthew Garrett <mjg@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Matthew Garrett <mjg@redhat.com>
diff --git a/drivers/platform/x86/acer-wmi.c b/drivers/platform/x86/acer-wmi.c
index dec558e..652ca18 100644
--- a/drivers/platform/x86/acer-wmi.c
+++ b/drivers/platform/x86/acer-wmi.c
@@ -772,6 +772,7 @@
obj->buffer.length == sizeof(u32)) {
devices = *((u32 *) obj->buffer.pointer);
} else {
+ kfree(out.pointer);
return AE_ERROR;
}
@@ -788,6 +789,7 @@
if (!(devices & 0x20))
max_brightness = 0x9;
+ kfree(out.pointer);
return status;
}
@@ -1094,6 +1096,7 @@
struct acpi_buffer out = {ACPI_ALLOCATE_BUFFER, NULL};
union acpi_object *obj;
acpi_status status;
+ u32 devices = 0;
status = wmi_query_block(WMID_GUID2, 1, &out);
if (ACPI_FAILURE(status))
@@ -1102,10 +1105,11 @@
obj = (union acpi_object *) out.pointer;
if (obj && obj->type == ACPI_TYPE_BUFFER &&
obj->buffer.length == sizeof(u32)) {
- return *((u32 *) obj->buffer.pointer);
- } else {
- return 0;
+ devices = *((u32 *) obj->buffer.pointer);
}
+
+ kfree(out.pointer);
+ return devices;
}
/*