From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1758308AbXHNV22 (ORCPT ); Tue, 14 Aug 2007 17:28:28 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1756520AbXHNVW7 (ORCPT ); Tue, 14 Aug 2007 17:22:59 -0400 Received: from emailhub.stusta.mhn.de ([141.84.69.5]:38406 "EHLO mailhub.stusta.mhn.de" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1752095AbXHNVWs (ORCPT ); Tue, 14 Aug 2007 17:22:48 -0400 Date: Tue, 14 Aug 2007 23:22:39 +0200 From: Adrian Bunk To: linux-kernel@vger.kernel.org Subject: [2.6 patch] drivers/char/n_hdlc.c: fix check-after-use Message-ID: <20070814212239.GZ18945@stusta.de> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline User-Agent: Mutt/1.5.16 (2007-06-11) Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org The Coverity checker spotted that we'd have already oops'ed if "tty" was NULL. Since "tty" can't be NULL when we reach this line of code this patch removes the NULL check. Signed-off-by: Adrian Bunk --- --- linux-2.6.23-rc1-mm2/drivers/char/n_hdlc.c.old 2007-08-08 06:11:02.000000000 +0200 +++ linux-2.6.23-rc1-mm2/drivers/char/n_hdlc.c 2007-08-08 06:11:15.000000000 +0200 @@ -220,25 +220,25 @@ static void n_hdlc_release(struct n_hdlc *n_hdlc) { struct tty_struct *tty = n_hdlc2tty (n_hdlc); struct n_hdlc_buf *buf; if (debuglevel >= DEBUG_LEVEL_INFO) printk("%s(%d)n_hdlc_release() called\n",__FILE__,__LINE__); /* Ensure that the n_hdlcd process is not hanging on select()/poll() */ wake_up_interruptible (&tty->read_wait); wake_up_interruptible (&tty->write_wait); - if (tty != NULL && tty->disc_data == n_hdlc) + if (tty->disc_data == n_hdlc) tty->disc_data = NULL; /* Break the tty->n_hdlc link */ /* Release transmit and receive buffers */ for(;;) { buf = n_hdlc_buf_get(&n_hdlc->rx_free_buf_list); if (buf) { kfree(buf); } else break; } for(;;) { buf = n_hdlc_buf_get(&n_hdlc->tx_free_buf_list);