From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753889AbcB2MN5 (ORCPT ); Mon, 29 Feb 2016 07:13:57 -0500 Received: from mail-pa0-f54.google.com ([209.85.220.54]:35233 "EHLO mail-pa0-f54.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753720AbcB2MN4 (ORCPT ); Mon, 29 Feb 2016 07:13:56 -0500 From: Sudip Mukherjee To: Jaroslav Kysela , Takashi Iwai Cc: linux-kernel@vger.kernel.org, alsa-devel@alsa-project.org, Sudip Mukherjee Subject: [PATCH] ALSA: mts64: fix NULL pointer dereference Date: Mon, 29 Feb 2016 17:43:30 +0530 Message-Id: <1456748010-17038-1-git-send-email-sudipm.mukherjee@gmail.com> X-Mailer: git-send-email 1.9.1 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org While registering pardev, the irq_func was also registered. As a result when we tried to probe for the card, an interrupt was generated and in the ISR we tried to dereference private_data. But private_data is still NULL as we have not yet done snd_mts64_create(). Lets probe for the card after mts64 is created. Reported-by: Fengguang Wu Fixes: 94a573500d48 ("ALSA: mts64: use new parport device model") Signed-off-by: Sudip Mukherjee --- sound/drivers/mts64.c | 11 ++++++----- 1 file changed, 6 insertions(+), 5 deletions(-) diff --git a/sound/drivers/mts64.c b/sound/drivers/mts64.c index c76bd87..fd4d18d 100644 --- a/sound/drivers/mts64.c +++ b/sound/drivers/mts64.c @@ -964,11 +964,6 @@ static int snd_mts64_probe(struct platform_device *pdev) err = -EIO; goto free_pardev; } - err = mts64_probe(p); - if (err) { - err = -EIO; - goto release_pardev; - } if ((err = snd_mts64_create(card, pardev, &mts)) < 0) { snd_printd("Cannot create main component\n"); @@ -976,6 +971,12 @@ static int snd_mts64_probe(struct platform_device *pdev) } card->private_data = mts; card->private_free = snd_mts64_card_private_free; + + err = mts64_probe(p); + if (err) { + err = -EIO; + goto __err; + } if ((err = snd_mts64_rawmidi_create(card)) < 0) { snd_printd("Creating Rawmidi component failed\n"); -- 1.9.1