From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Google-Smtp-Source: AIpwx4+g+KvGXcIWitg0EO7H8/r66xTHqncgS8SXipgI373xXo2Qg4UR6FpFuvIgwFx3qGfLnYqj ARC-Seal: i=1; a=rsa-sha256; t=1522168725; cv=none; d=google.com; s=arc-20160816; b=llEplTUsj4sG/rLxFWcPS7tEok/v1Bbo6bvRdxkUGyA9rwDgfbeX02v5hQPPJ8Xet0 pbGrfGbpiPTo2xzZlBmijO0sM0TlvETv6Rubv5o8mP5bMhuUnPc84HPGwMZ3QUXmBjCa 5WTVdPLpM7DeMR8O9xfeg8zIkfGmzTHIC86pekN4ENR5nOKy6EsKOs/5ZzfNcFAYDvlj S7omr2Uj/oIYCJPTeWmeKGqRgDbl791D/3VNaXTBMjnvKKO5k9WIvKY4VjIXcp+UVTA4 9HA4A3TJ8k0aVTk15Ba9xMkZza3/xpOO26IN4ocuLSvfmusB/tXUDL+GEn36Wc6V8utv /naA== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=mime-version:user-agent:references:in-reply-to:message-id:date :subject:cc:to:from:arc-authentication-results; bh=mAaxx8W25p2iwaZKkMfJeTbRIoaKotYPqaKBRuzs5bI=; b=P2ysP8bFQc+uszaxcvWj1TCbcisU+HIdzrTC9c/RaAF7TtSBZCQPTObQDmll1hdL6m aH3QXXQ+8wWvFwTf49YSHMzW1qAkK43lddJ8AlzU0Bkubwf5yYNo6nxyhBwQjWQJMMDI QZaADLUO4hsxoc6BR6vzBR/bct2J0SqvoxgobpxXLjHc0nwSjpgrmiZTj+gbGEK3HRQF +/kPQQVbbOUiRAlCcZZmlYWOVyk4G+cvZDt1R/YrxOCUP/iahwAKhnEN5OxbifYy+8zx VTP9qnCZ/LWtprMw8mEnxV54owz8jA+TA1n0JxO38tSzj3RlKb+GBAybVocosc9DMR2+ JGTQ== ARC-Authentication-Results: i=1; mx.google.com; spf=softfail (google.com: domain of transitioning gregkh@linuxfoundation.org does not designate 90.92.61.202 as permitted sender) smtp.mailfrom=gregkh@linuxfoundation.org Authentication-Results: mx.google.com; spf=softfail (google.com: domain of transitioning gregkh@linuxfoundation.org does not designate 90.92.61.202 as permitted sender) smtp.mailfrom=gregkh@linuxfoundation.org From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Takashi Iwai Subject: [PATCH 4.15 010/105] ALSA: aloop: Sync stale timer before release Date: Tue, 27 Mar 2018 18:26:50 +0200 Message-Id: <20180327162758.275427660@linuxfoundation.org> X-Mailer: git-send-email 2.16.3 In-Reply-To: <20180327162757.813009222@linuxfoundation.org> References: <20180327162757.813009222@linuxfoundation.org> User-Agent: quilt/0.65 X-stable: review MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 X-getmail-retrieved-from-mailbox: INBOX X-GMAIL-LABELS: =?utf-8?b?IlxcU2VudCI=?= X-GMAIL-THRID: =?utf-8?q?1596108966146987882?= X-GMAIL-MSGID: =?utf-8?q?1596109593982571296?= X-Mailing-List: linux-kernel@vger.kernel.org List-ID: 4.15-stable review patch. If anyone has any objections, please let me know. ------------------ From: Takashi Iwai commit 67a01afaf3d34893cf7d2ea19b34555d6abb7cb0 upstream. The aloop driver tries to stop the pending timer via timer_del() in the trigger callback and in the close callback. The former is correct, as it's an atomic operation, while the latter expects that the timer gets really removed and proceeds the resource releases after that. But timer_del() doesn't synchronize, hence the running timer may still access the released resources. A similar situation can be also seen in the prepare callback after trigger(STOP) where the prepare tries to re-initialize the things while a timer is still running. The problems like the above are seen indirectly in some syzkaller reports (although it's not 100% clear whether this is the only cause, as the race condition is quite narrow and not always easy to trigger). For addressing these issues, this patch adds the explicit alls of timer_del_sync() in some places, so that the pending timer is properly killed / synced. Cc: Signed-off-by: Takashi Iwai Signed-off-by: Greg Kroah-Hartman --- sound/drivers/aloop.c | 9 ++++++++- 1 file changed, 8 insertions(+), 1 deletion(-) --- a/sound/drivers/aloop.c +++ b/sound/drivers/aloop.c @@ -192,6 +192,11 @@ static inline void loopback_timer_stop(s dpcm->timer.expires = 0; } +static inline void loopback_timer_stop_sync(struct loopback_pcm *dpcm) +{ + del_timer_sync(&dpcm->timer); +} + #define CABLE_VALID_PLAYBACK (1 << SNDRV_PCM_STREAM_PLAYBACK) #define CABLE_VALID_CAPTURE (1 << SNDRV_PCM_STREAM_CAPTURE) #define CABLE_VALID_BOTH (CABLE_VALID_PLAYBACK|CABLE_VALID_CAPTURE) @@ -326,6 +331,8 @@ static int loopback_prepare(struct snd_p struct loopback_cable *cable = dpcm->cable; int bps, salign; + loopback_timer_stop_sync(dpcm); + salign = (snd_pcm_format_width(runtime->format) * runtime->channels) / 8; bps = salign * runtime->rate; @@ -744,7 +751,7 @@ static int loopback_close(struct snd_pcm struct loopback *loopback = substream->private_data; struct loopback_pcm *dpcm = substream->runtime->private_data; - loopback_timer_stop(dpcm); + loopback_timer_stop_sync(dpcm); mutex_lock(&loopback->cable_lock); free_cable(substream); mutex_unlock(&loopback->cable_lock);