From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 10C29223326; Thu, 12 Dec 2024 17:01:22 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1734022882; cv=none; b=U4qcMCVFSEepYslRdI5APT0JkSqO6attWMNdPWeQZU+T2lweWHw6J7VkVzwwYPa3FRAfIEviUctxE31pLHD2TtZEsQFmT3Rw7f+c4YtU37B6kr9ATiEea/L1xt6PZUx5SSh19veB6pcOn02H1jqs9g+a7Ilrt6PDjLgrnVEPgW0= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1734022882; c=relaxed/simple; bh=9dwRpKNZzeU8bP53oaQ8l9iAeAWZCr78a48qaLPtSvY=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=ZXA7EtwVQJywR7n1D6lErJaPXj14l5KJYHJH0C03VoKIxdPwfoAobRlxQkb4yx+VlXQw0+fjbmIJ+aVk6oYQQu8uvKqQg+wKcdPP9AcjIirWhPimi7jmFYqpCu1NQIuD7Us8p5yizPMoIYfteyH3rQ0eBzJ3Gt8nEOF4Rw4Dljc= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=TNhouiAx; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="TNhouiAx" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 6A3ECC4CECE; Thu, 12 Dec 2024 17:01:21 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1734022881; bh=9dwRpKNZzeU8bP53oaQ8l9iAeAWZCr78a48qaLPtSvY=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=TNhouiAxaTE/5MjQfxZ8YHxWrlby3+ZTlyuZdtFtqEVnyQIfIE4ZKDxv04U+RtvnJ nW7e0rDoHIqm/Ju4nF7eE6jenG9Z4KpaYggYQGRmxonTeD4Uw8IpwC6HkV7Bz0TAW4 jHp+4WPJmQZkxsj581E7twAyuNsVzPSQTWtdhSVI= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Yongliang Gao , Jingqun Li , Alexandre Belloni , Sasha Levin Subject: [PATCH 5.15 360/565] rtc: check if __rtc_read_time was successful in rtc_timer_do_work() Date: Thu, 12 Dec 2024 15:59:15 +0100 Message-ID: <20241212144325.842764285@linuxfoundation.org> X-Mailer: git-send-email 2.47.1 In-Reply-To: <20241212144311.432886635@linuxfoundation.org> References: <20241212144311.432886635@linuxfoundation.org> User-Agent: quilt/0.67 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 5.15-stable review patch. If anyone has any objections, please let me know. ------------------ From: Yongliang Gao [ Upstream commit e8ba8a2bc4f60a1065f23d6a0e7cbea945a0f40d ] If the __rtc_read_time call fails,, the struct rtc_time tm; may contain uninitialized data, or an illegal date/time read from the RTC hardware. When calling rtc_tm_to_ktime later, the result may be a very large value (possibly KTIME_MAX). If there are periodic timers in rtc->timerqueue, they will continually expire, may causing kernel softlockup. Fixes: 6610e0893b8b ("RTC: Rework RTC code to use timerqueue for events") Signed-off-by: Yongliang Gao Acked-by: Jingqun Li Link: https://lore.kernel.org/r/20241011043153.3788112-1-leonylgao@gmail.com Signed-off-by: Alexandre Belloni Signed-off-by: Sasha Levin --- drivers/rtc/interface.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) diff --git a/drivers/rtc/interface.c b/drivers/rtc/interface.c index 29c12947e73fc..7c62b13077627 100644 --- a/drivers/rtc/interface.c +++ b/drivers/rtc/interface.c @@ -893,13 +893,18 @@ void rtc_timer_do_work(struct work_struct *work) struct timerqueue_node *next; ktime_t now; struct rtc_time tm; + int err; struct rtc_device *rtc = container_of(work, struct rtc_device, irqwork); mutex_lock(&rtc->ops_lock); again: - __rtc_read_time(rtc, &tm); + err = __rtc_read_time(rtc, &tm); + if (err) { + mutex_unlock(&rtc->ops_lock); + return; + } now = rtc_tm_to_ktime(tm); while ((next = timerqueue_getnext(&rtc->timerqueue))) { if (next->expires > now) -- 2.43.0