From patchwork Wed Mar 5 11:18:24 2014 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Takashi Iwai X-Patchwork-Id: 3773421 X-Patchwork-Delegate: tiwai@suse.de Return-Path: X-Original-To: patchwork-alsa-devel@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork1.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.19.201]) by patchwork1.web.kernel.org (Postfix) with ESMTP id 932BF9F1EE for ; Wed, 5 Mar 2014 11:37:55 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id C508220251 for ; Wed, 5 Mar 2014 11:37:54 +0000 (UTC) Received: from alsa0.perex.cz (alsa0.perex.cz [77.48.224.243]) by mail.kernel.org (Postfix) with ESMTP id D30EA20213 for ; Wed, 5 Mar 2014 11:37:53 +0000 (UTC) Received: by alsa0.perex.cz (Postfix, from userid 1000) id 760402650F5; Wed, 5 Mar 2014 12:37:52 +0100 (CET) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Spam-Level: X-Spam-Status: No, score=-1.9 required=5.0 tests=BAYES_00, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 Received: from alsa0.perex.cz (localhost [IPv6:::1]) by alsa0.perex.cz (Postfix) with ESMTP id ABD142650FE; Wed, 5 Mar 2014 12:30:20 +0100 (CET) X-Original-To: alsa-devel@alsa-project.org Delivered-To: alsa-devel@alsa-project.org Received: by alsa0.perex.cz (Postfix, from userid 1000) id 107B0265955; Wed, 5 Mar 2014 12:30:17 +0100 (CET) Received: from mx2.suse.de (cantor2.suse.de [195.135.220.15]) by alsa0.perex.cz (Postfix) with ESMTP id 244F1265953 for ; Wed, 5 Mar 2014 12:18:25 +0100 (CET) Received: from relay1.suse.de (charybdis-ext.suse.de [195.135.220.254]) by mx2.suse.de (Postfix) with ESMTP id C00B0ACC8; Wed, 5 Mar 2014 11:18:24 +0000 (UTC) From: Takashi Iwai To: alsa-devel@alsa-project.org Date: Wed, 5 Mar 2014 12:18:24 +0100 Message-Id: <1394018304-23949-1-git-send-email-tiwai@suse.de> X-Mailer: git-send-email 1.9.0 Cc: Dan Carpenter Subject: [alsa-devel] [PATCH] ALSA: emu10k1: Fix possible NULL dereference X-BeenThere: alsa-devel@alsa-project.org X-Mailman-Version: 2.1.14 Precedence: list List-Id: "Alsa-devel mailing list for ALSA developers - http://www.alsa-project.org" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Errors-To: alsa-devel-bounces@alsa-project.org Sender: alsa-devel-bounces@alsa-project.org X-Virus-Scanned: ClamAV using ClamSMTP The previous dev_err() conversion resulted in a code that may give NULL dereference in snd_emu10k1_ptr_write(). Since it's a sanity check, better to be replaced with a debug macro like other places in this driver. Fixes: 6f002b02166c ('ALSA: emu10k1: Use standard printk helpers') Reported-by: Dan Carpenter Signed-off-by: Takashi Iwai --- sound/pci/emu10k1/io.c | 5 +---- 1 file changed, 1 insertion(+), 4 deletions(-) diff --git a/sound/pci/emu10k1/io.c b/sound/pci/emu10k1/io.c index 81c75b4528d9..706b4f0c6806 100644 --- a/sound/pci/emu10k1/io.c +++ b/sound/pci/emu10k1/io.c @@ -71,11 +71,8 @@ void snd_emu10k1_ptr_write(struct snd_emu10k1 *emu, unsigned int reg, unsigned i unsigned long flags; unsigned int mask; - if (!emu) { - dev_err(emu->card->dev, "ptr_write: emu is null!\n"); - dump_stack(); + if (snd_BUG_ON(!emu)) return; - } mask = emu->audigy ? A_PTR_ADDRESS_MASK : PTR_ADDRESS_MASK; regptr = ((reg << 16) & mask) | (chn & PTR_CHANNELNUM_MASK);