From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id E2F40C25B0F for ; Sun, 14 Aug 2022 16:39:00 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S240838AbiHNQi7 (ORCPT ); Sun, 14 Aug 2022 12:38:59 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:47562 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S242981AbiHNQhL (ORCPT ); Sun, 14 Aug 2022 12:37:11 -0400 Received: from dfw.source.kernel.org (dfw.source.kernel.org [139.178.84.217]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id D23A95C36D; Sun, 14 Aug 2022 09:29:08 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id 0D37C60EF8; Sun, 14 Aug 2022 16:29:08 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 2502BC433C1; Sun, 14 Aug 2022 16:29:06 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1660494547; bh=Nned1RlZpWiZahe4FRxH3L5S5eEsVREKwZPn00BfNAE=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=RkYZ5ilQyK+GBR+c1opsXj1U866BKkC99hg2EEAxa+NroHwPQirjTxQDqV8jQQj1d Eqe1BSHVesedzXRgQ8RV5Xj7BCe+S2XxnmqOcRJFSgOsBOuXbC5dFswOUjzVj/zGGL SuHOE4riMmFSeijl6OrMXX+F9e82q9oG+KnNewLG/8KlHWK+ChszoO8wq+8Zar/Cmz 40apVNOVGA+8kEDRrwze9gClggm/ZE+M0FJ5sHR/jxu1SsmaP0WQWKWZLZos2eke5T n+q/ZCkLyridg/TEBjQixw/6WYhjk9oLEK7PBK0M78nGZU6+raoJV3VK5f7bqAVXNU iGk3K6n1Q8yRg== From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Takashi Iwai , syzbot+1ee0910eca9c94f71f25@syzkaller.appspotmail.com, syzbot+49b10793b867871ee26f@syzkaller.appspotmail.com, syzbot+8285e973a41b5aa68902@syzkaller.appspotmail.com, Sasha Levin , perex@perex.cz, tiwai@suse.com, wangwensheng4@huawei.com, alsa-devel@alsa-project.org Subject: [PATCH AUTOSEL 5.4 11/16] ALSA: timer: Use deferred fasync helper Date: Sun, 14 Aug 2022 12:28:26 -0400 Message-Id: <20220814162833.2398478-11-sashal@kernel.org> X-Mailer: git-send-email 2.35.1 In-Reply-To: <20220814162833.2398478-1-sashal@kernel.org> References: <20220814162833.2398478-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Takashi Iwai [ Upstream commit 95cc637c1afd83fb7dd3d7c8a53710488f4caf9c ] For avoiding the potential deadlock via kill_fasync() call, use the new fasync helpers to defer the invocation from PCI API. Note that it's merely a workaround. Reported-by: syzbot+1ee0910eca9c94f71f25@syzkaller.appspotmail.com Reported-by: syzbot+49b10793b867871ee26f@syzkaller.appspotmail.com Reported-by: syzbot+8285e973a41b5aa68902@syzkaller.appspotmail.com Link: https://lore.kernel.org/r/20220728125945.29533-3-tiwai@suse.de Signed-off-by: Takashi Iwai Signed-off-by: Sasha Levin --- sound/core/timer.c | 11 ++++++----- 1 file changed, 6 insertions(+), 5 deletions(-) diff --git a/sound/core/timer.c b/sound/core/timer.c index d684aa4150aa..420cc07a7f88 100644 --- a/sound/core/timer.c +++ b/sound/core/timer.c @@ -61,7 +61,7 @@ struct snd_timer_user { unsigned int filter; struct timespec tstamp; /* trigger tstamp */ wait_queue_head_t qchange_sleep; - struct fasync_struct *fasync; + struct snd_fasync *fasync; struct mutex ioctl_lock; }; @@ -1317,7 +1317,7 @@ static void snd_timer_user_interrupt(struct snd_timer_instance *timeri, } __wake: spin_unlock(&tu->qlock); - kill_fasync(&tu->fasync, SIGIO, POLL_IN); + snd_kill_fasync(tu->fasync, SIGIO, POLL_IN); wake_up(&tu->qchange_sleep); } @@ -1354,7 +1354,7 @@ static void snd_timer_user_ccallback(struct snd_timer_instance *timeri, spin_lock_irqsave(&tu->qlock, flags); snd_timer_user_append_to_tqueue(tu, &r1); spin_unlock_irqrestore(&tu->qlock, flags); - kill_fasync(&tu->fasync, SIGIO, POLL_IN); + snd_kill_fasync(tu->fasync, SIGIO, POLL_IN); wake_up(&tu->qchange_sleep); } @@ -1421,7 +1421,7 @@ static void snd_timer_user_tinterrupt(struct snd_timer_instance *timeri, spin_unlock(&tu->qlock); if (append == 0) return; - kill_fasync(&tu->fasync, SIGIO, POLL_IN); + snd_kill_fasync(tu->fasync, SIGIO, POLL_IN); wake_up(&tu->qchange_sleep); } @@ -1487,6 +1487,7 @@ static int snd_timer_user_release(struct inode *inode, struct file *file) if (tu->timeri) snd_timer_close(tu->timeri); mutex_unlock(&tu->ioctl_lock); + snd_fasync_free(tu->fasync); kfree(tu->queue); kfree(tu->tqueue); kfree(tu); @@ -2050,7 +2051,7 @@ static int snd_timer_user_fasync(int fd, struct file * file, int on) struct snd_timer_user *tu; tu = file->private_data; - return fasync_helper(fd, file, on, &tu->fasync); + return snd_fasync_helper(fd, file, on, &tu->fasync); } static ssize_t snd_timer_user_read(struct file *file, char __user *buffer, -- 2.35.1