From nobody Thu Dec 18 12:43:42 2025 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 D3B50C32793 for ; Tue, 23 Aug 2022 09:26:47 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1350108AbiHWJZ0 (ORCPT ); Tue, 23 Aug 2022 05:25:26 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:37516 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1346369AbiHWJYa (ORCPT ); Tue, 23 Aug 2022 05:24:30 -0400 Received: from ams.source.kernel.org (ams.source.kernel.org [IPv6:2604:1380:4601:e00::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id A53EF9019A; Tue, 23 Aug 2022 01:35:48 -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 ams.source.kernel.org (Postfix) with ESMTPS id 0D5A6B81C1B; Tue, 23 Aug 2022 08:34:40 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 569D5C433D7; Tue, 23 Aug 2022 08:34:38 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1661243678; bh=BWjidRQ+edWUR4aH7drez7StIMEyzcJyA/RtL4QAKXA=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=PaeCGs2OXk/8avndwVV/HgzjRsy1ZuS4sp3oWw8bQBBNjO847CQDfE1ExPGoYj5k0 GaGu25whOtxyL2q4VdnEjLUSskvrzoNcbnwcMl0N3HSSU797xQkqFtotgsP4QD7/Jt XldaoiSGob7OUIYGMdkOzlqC8JK0z9RDpcZ13ydg= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, syzbot+8285e973a41b5aa68902@syzkaller.appspotmail.com, syzbot+669c9abf11a6a011dd09@syzkaller.appspotmail.com, Takashi Iwai , Sasha Levin Subject: [PATCH 5.19 353/365] ALSA: pcm: Use deferred fasync helper Date: Tue, 23 Aug 2022 10:04:14 +0200 Message-Id: <20220823080133.039157499@linuxfoundation.org> X-Mailer: git-send-email 2.37.2 In-Reply-To: <20220823080118.128342613@linuxfoundation.org> References: <20220823080118.128342613@linuxfoundation.org> User-Agent: quilt/0.67 MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" From: Takashi Iwai [ Upstream commit 96b097091c66df4f6fbf5cbff21df6cc02a2f055 ] For avoiding the potential deadlock via kill_fasync() call, use the new fasync helpers to defer the invocation from timer API. Note that it's merely a workaround. Reported-by: syzbot+8285e973a41b5aa68902@syzkaller.appspotmail.com Reported-by: syzbot+669c9abf11a6a011dd09@syzkaller.appspotmail.com Link: https://lore.kernel.org/r/20220728125945.29533-4-tiwai@suse.de Signed-off-by: Takashi Iwai Signed-off-by: Sasha Levin --- include/sound/pcm.h | 2 +- sound/core/pcm.c | 1 + sound/core/pcm_lib.c | 2 +- sound/core/pcm_native.c | 2 +- 4 files changed, 4 insertions(+), 3 deletions(-) diff --git a/include/sound/pcm.h b/include/sound/pcm.h index 6b99310b5b88..6987110843f0 100644 --- a/include/sound/pcm.h +++ b/include/sound/pcm.h @@ -399,7 +399,7 @@ struct snd_pcm_runtime { snd_pcm_uframes_t twake; /* do transfer (!poll) wakeup if non-zero */ wait_queue_head_t sleep; /* poll sleep */ wait_queue_head_t tsleep; /* transfer sleep */ - struct fasync_struct *fasync; + struct snd_fasync *fasync; bool stop_operating; /* sync_stop will be called */ struct mutex buffer_mutex; /* protect for buffer changes */ atomic_t buffer_accessing; /* >0: in r/w operation, <0: blocked */ diff --git a/sound/core/pcm.c b/sound/core/pcm.c index 977d54320a5c..c917ac84a7e5 100644 --- a/sound/core/pcm.c +++ b/sound/core/pcm.c @@ -1005,6 +1005,7 @@ void snd_pcm_detach_substream(struct snd_pcm_substrea= m *substream) substream->runtime =3D NULL; } mutex_destroy(&runtime->buffer_mutex); + snd_fasync_free(runtime->fasync); kfree(runtime); put_pid(substream->pid); substream->pid =3D NULL; diff --git a/sound/core/pcm_lib.c b/sound/core/pcm_lib.c index 1fc7c50ffa62..40751e5aff09 100644 --- a/sound/core/pcm_lib.c +++ b/sound/core/pcm_lib.c @@ -1822,7 +1822,7 @@ void snd_pcm_period_elapsed_under_stream_lock(struct = snd_pcm_substream *substrea snd_timer_interrupt(substream->timer, 1); #endif _end: - kill_fasync(&runtime->fasync, SIGIO, POLL_IN); + snd_kill_fasync(runtime->fasync, SIGIO, POLL_IN); } EXPORT_SYMBOL(snd_pcm_period_elapsed_under_stream_lock); =20 diff --git a/sound/core/pcm_native.c b/sound/core/pcm_native.c index 4adaee62ef33..16fcf57c6f03 100644 --- a/sound/core/pcm_native.c +++ b/sound/core/pcm_native.c @@ -3945,7 +3945,7 @@ static int snd_pcm_fasync(int fd, struct file * file,= int on) runtime =3D substream->runtime; if (runtime->status->state =3D=3D SNDRV_PCM_STATE_DISCONNECTED) return -EBADFD; - return fasync_helper(fd, file, on, &runtime->fasync); + return snd_fasync_helper(fd, file, on, &runtime->fasync); } =20 /* --=20 2.35.1