linux-kernel - [PATCH v2] platform/x86: thinkpad_acpi: Initialize local in_tablet

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Date:   Wed, 14 Dec 2016 20:14:24 -0800
From:   Darren Hart <dvhart@...ux.intel.com>
To:     Lyude <lyude@...hat.com>,
        Henrique de Moraes Holschuh <hmh@....eng.br>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Cc:     linux-next@...r.kernel.org, linux-kernel@...r.kernel.org,
        platform-drivers-x86@...r.kernel.org
Subject: [PATCH v2] platform/x86: thinkpad_acpi: Initialize local
 in_tablet_mode and type

linux-next reported in_tablet_mode and type may be used uninitialized
after:

b31800283868 ("platform/x86: thinkpad_acpi: Move tablet detection into separate function")

This turns out to be a false positive as the pr_info call cannot be
reached if tp_features.hotkey_tablet (global scope) is 0, and
in_tablet_mode and type are assigned in both places
tp_features.hotkey_tablet is assigned.

Regardless, to make it explicit and avoid further reports, initialize
in_tablet_mode to 0 and type to "".

Signed-off-by: Darren Hart <dvhart@...ux.intel.com>
Cc: Lyude <lyude@...hat.com>
Cc: Henrique de Moraes Holschuh <hmh@....eng.br>
Cc: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
---
Since v1: Initialize type also.

 drivers/platform/x86/thinkpad_acpi.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/platform/x86/thinkpad_acpi.c b/drivers/platform/x86/thinkpad_acpi.c
index 69cb0da..c408390 100644
--- a/drivers/platform/x86/thinkpad_acpi.c
+++ b/drivers/platform/x86/thinkpad_acpi.c
@@ -3143,8 +3143,8 @@ typedef tpacpi_keymap_entry_t tpacpi_keymap_t[TPACPI_HOTKEY_MAP_LEN];
 
 static int hotkey_init_tablet_mode(void)
 {
-	int in_tablet_mode, res;
-	char *type;
+	int in_tablet_mode = 0, res;
+	char *type = "";
 
 	if (acpi_evalf(hkey_handle, &res, "MHKG", "qd")) {
 		/* For X41t, X60t, X61t Tablets... */
-- 
2.9.3


-- 
Darren Hart
Intel Open Source Technology Center