From: Tom Rix <trix@redhat.com>
Date: Sun, 13 Sep 2020 19:02:03 +0000 (-0700)
Subject: platform/x86: thinkpad_acpi: initialize tp_nvram_state variable
X-Git-Tag: v4.14.201~33
X-Git-Url: https://www.infradead.org/git/?a=commitdiff_plain;h=515ded02bc4b0d8900d04e0cab781a13408b1fd6;p=users%2Fdwmw2%2Flinux.git

platform/x86: thinkpad_acpi: initialize tp_nvram_state variable

commit 5f38b06db8af3ed6c2fc1b427504ca56fae2eacc upstream.

clang static analysis flags this represenative problem
thinkpad_acpi.c:2523:7: warning: Branch condition evaluates
  to a garbage value
                if (!oldn->mute ||
                    ^~~~~~~~~~~

In hotkey_kthread() mute is conditionally set by hotkey_read_nvram()
but unconditionally checked by hotkey_compare_and_issue_event().
So the tp_nvram_state variable s[2] needs to be initialized.

Fixes: 01e88f25985d ("ACPI: thinkpad-acpi: add CMOS NVRAM polling for hot keys (v9)")
Signed-off-by: Tom Rix <trix@redhat.com>
Reviewed-by: Hans de Goede <hdegoede@redhat.com>
Acked-by: mark gross <mgross@linux.intel.com>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---

diff --git a/drivers/platform/x86/thinkpad_acpi.c b/drivers/platform/x86/thinkpad_acpi.c
index c3fb9d66b7683..b073eed0763c5 100644
--- a/drivers/platform/x86/thinkpad_acpi.c
+++ b/drivers/platform/x86/thinkpad_acpi.c
@@ -2477,7 +2477,7 @@ static void hotkey_compare_and_issue_event(struct tp_nvram_state *oldn,
  */
 static int hotkey_kthread(void *data)
 {
-	struct tp_nvram_state s[2];
+	struct tp_nvram_state s[2] = { 0 };
 	u32 poll_mask, event_mask;
 	unsigned int si, so;
 	unsigned long t;