linux-kernel - [V2][PATCH] vt: keyboard, fix uninitialized variables warning

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Date:   Thu, 4 Mar 2021 11:10:48 +0800
From:   Li Wang <li.wang@...driver.com>
To:     <gregkh@...uxfoundation.org>, <jirislaby@...nel.org>,
        <andriy.shevchenko@...ux.intel.com>, <dmitry.torokhov@...il.com>,
        <linux-kernel@...r.kernel.org>, <li.wang@...driver.com>
Subject: [V2][PATCH] vt: keyboard, fix uninitialized variables warning

drivers/tty/vt/keyboard.c: In function 'vt_do_kdgkb_ioctl':
drivers/tty/vt/keyboard.c: warning: 'ret' may be used uninitialized in this function [-Wmaybe-uninitialized]
  return ret;
         ^~~
drivers/tty/vt/keyboard.c: warning: 'kbs' may be used uninitialized in this function [-Wmaybe-uninitialized]
  kfree(kbs);
  ^~~~~~~~~~

Signed-off-by: Li Wang <li.wang@...driver.com>
---
 drivers/tty/vt/keyboard.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/tty/vt/keyboard.c b/drivers/tty/vt/keyboard.c
index 7763862..62f1ecb 100644
--- a/drivers/tty/vt/keyboard.c
+++ b/drivers/tty/vt/keyboard.c
@@ -2090,6 +2090,8 @@ int vt_do_kdgkb_ioctl(int cmd, struct kbsentry __user *user_kdgkb, int perm)
 
 		ret = 0;
 		break;
+	default:
+		return -EINVAL;
 	}
 
 	kfree(kbs);
-- 
2.7.4