This is a note to let you know that I've just added the patch titled
platform/x86: dell-ddv: Return error if buffer is empty
to the 6.2-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
platform-x86-dell-ddv-return-error-if-buffer-is-empt.patch
and it can be found in the queue-6.2 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit bc3a20f0cdc44e3a500026a5b3a54c11d570399e
Author: Armin Wolf <W_Armin@xxxxxx>
Date: Thu Jan 26 20:40:18 2023 +0100
platform/x86: dell-ddv: Return error if buffer is empty
[ Upstream commit 36d44825faf42903a0b92dd49a9620e2cbdcbe18 ]
In several cases, the DDV WMI interface can return buffers
with a length of zero. Return -ENODATA in such a case for
proper error handling. Also replace some -EIO errors with
more specialized ones.
Signed-off-by: Armin Wolf <W_Armin@xxxxxx>
Link: https://lore.kernel.org/r/20230126194021.381092-3-W_Armin@xxxxxx
Reviewed-by: Hans de Goede <hdegoede@xxxxxxxxxx>
Signed-off-by: Hans de Goede <hdegoede@xxxxxxxxxx>
Stable-dep-of: 0331b1b0ba65 ("platform/x86: dell-ddv: Fix temperature scaling")
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/platform/x86/dell/dell-wmi-ddv.c b/drivers/platform/x86/dell/dell-wmi-ddv.c
index 9cb6ae42dbdc8..f99c4cb686fdc 100644
--- a/drivers/platform/x86/dell/dell-wmi-ddv.c
+++ b/drivers/platform/x86/dell/dell-wmi-ddv.c
@@ -11,6 +11,7 @@
#include <linux/debugfs.h>
#include <linux/device.h>
#include <linux/dev_printk.h>
+#include <linux/errno.h>
#include <linux/kernel.h>
#include <linux/kstrtox.h>
#include <linux/math.h>
@@ -125,21 +126,27 @@ static int dell_wmi_ddv_query_buffer(struct wmi_device *wdev, enum dell_ddv_meth
if (ret < 0)
return ret;
- if (obj->package.count != 2)
- goto err_free;
+ if (obj->package.count != 2 ||
+ obj->package.elements[0].type != ACPI_TYPE_INTEGER ||
+ obj->package.elements[1].type != ACPI_TYPE_BUFFER) {
+ ret = -ENOMSG;
- if (obj->package.elements[0].type != ACPI_TYPE_INTEGER)
goto err_free;
+ }
buffer_size = obj->package.elements[0].integer.value;
- if (obj->package.elements[1].type != ACPI_TYPE_BUFFER)
+ if (!buffer_size) {
+ ret = -ENODATA;
+
goto err_free;
+ }
if (buffer_size > obj->package.elements[1].buffer.length) {
dev_warn(&wdev->dev,
FW_WARN "WMI buffer size (%llu) exceeds ACPI buffer size (%d)\n",
buffer_size, obj->package.elements[1].buffer.length);
+ ret = -EMSGSIZE;
goto err_free;
}
@@ -151,7 +158,7 @@ static int dell_wmi_ddv_query_buffer(struct wmi_device *wdev, enum dell_ddv_meth
err_free:
kfree(obj);
- return -EIO;
+ return ret;
}
static int dell_wmi_ddv_query_string(struct wmi_device *wdev, enum dell_ddv_method method,
