platform/x86: dell-smbios-wmi: Avoid false-positive memcpy() warning

In preparation for FORTIFY_SOURCE performing compile-time and run-time
field bounds checking for memcpy(), memmove(), and memset(), avoid
intentionally writing across neighboring fields.

Since all the size checking has already happened, use input.pointer
(void *) so memcpy() doesn't get confused about how much is being
written.

Avoids this false-positive warning when run-time memcpy() strict
bounds checking is enabled:

memcpy: detected field-spanning write (size 4096) of single field (size 36)
WARNING: CPU: 0 PID: 357 at drivers/platform/x86/dell/dell-smbios-wmi.c:74 run_smbios_call+0x110/0x1e0 [dell_smbios]

Cc: Hans de Goede <[email protected]>
Cc: Mark Gross <[email protected]>
Cc: Mario Limonciello <[email protected]>
Cc: "Pali Rohár" <[email protected]>
Cc: Andy Shevchenko <[email protected]>
Cc: "Uwe Kleine-König" <[email protected]>
Cc: [email protected]
Cc: [email protected]
Reported-by: Andy Lavr <[email protected]>
Signed-off-by: Kees Cook <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Reviewed-by: Hans de Goede <[email protected]>
Signed-off-by: Hans de Goede <[email protected]>

Author: kees

drivers/platform/x86/dell/dell-smbios-wmi.c

@@ -71,7 +71,7 @@ static int run_smbios_call(struct wmi_device *wdev)
 				obj->integer.value);
 		return -EIO;
 	}
-	memcpy(&priv->buf->std, obj->buffer.pointer, obj->buffer.length);
+	memcpy(input.pointer, obj->buffer.pointer, obj->buffer.length);
 	dev_dbg(&wdev->dev, "result: [%08x,%08x,%08x,%08x]\n",
 		priv->buf->std.output[0], priv->buf->std.output[1],
 		priv->buf->std.output[2], priv->buf->std.output[3]);