From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Google-Smtp-Source: AH8x225wSqJfKl2+q+r4WEH4oy5DPtPE3PlzPwKBJ+hqfqP5cX+sWaj0f2+vNfufhCaqznyZAPw6 ARC-Seal: i=1; a=rsa-sha256; t=1519676571; cv=none; d=google.com; s=arc-20160816; b=jdt1o16qrK2ywK1SEeJbKc2GB+NqPFtCey3EuPX0cruOztfs9V9V5ZyChuGsWFvXr3 2fFdzi0MqWoNerbYjmMLL93NRWX6hcWTdIjC5CEMLMtsJaLCROjVQlycT3v+ygyj4qzW 3QMB3i32GOxwSnYGja5wbT8dqqvSdqBoN/sa2dwSTWmUx4z/VJkamu4r15/8U9LcLakc zFdKwCMFQhdzJBtluoZsw7s7jbkPVhnlxcMMPAYJmwX1YZyk/aS8XGjEfo4XK+c/xHaI sOzcDIydZyFbAutGkFPB5pMCTCq7wSPJVvHaeHgilr5gybiOY95TBSVzMxZ3mgCVEQAD O/+g== 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=Iaspw5zngV/tY8HTOXEgH0r9My34m6SHMZihsk/GDpc=; b=FDCS9CCdwLLAI7hAHHNRPHPhA0eNv0K51GgCFnvrvYioK4PsmE1oCJ3JFaX9HSQuzc dGaPgmqvoUADFRZmmVbQ/dW1jIai38B9zC4Jfy+7YTqmfmAseIM2OyI4J563uPaqT5OS 84o6sD2XrXAtGZvgdQ/nsz1XDVJMFzLFxIOT2EtoHkot4QOuBDDpedYxq+l6i2YAUQAc IcmfcmnrOIP6vtStSmkN3kIiQGj1VS2LVfX1fdTwYA2XMAJd8mFU45LDFi9i8t2NFgn/ 5EJnJvWut9OyuTzkJtDFmc4q65LHvLfwRlHSWoimHvRted+lkaKsWR/p1x1dJ+QWpEfc gxLw== ARC-Authentication-Results: i=1; mx.google.com; spf=softfail (google.com: domain of transitioning gregkh@linuxfoundation.org does not designate 83.175.124.243 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 83.175.124.243 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, Robin Getz , Lars-Peter Clausen , Stable@vger.kernel.org, Jonathan Cameron Subject: [PATCH 4.9 09/39] iio: adis_lib: Initialize trigger before requesting interrupt Date: Mon, 26 Feb 2018 21:20:30 +0100 Message-Id: <20180226201644.080040089@linuxfoundation.org> X-Mailer: git-send-email 2.16.2 In-Reply-To: <20180226201643.660109883@linuxfoundation.org> References: <20180226201643.660109883@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?1593495970626183407?= X-GMAIL-MSGID: =?utf-8?q?1593496380367730933?= X-Mailing-List: linux-kernel@vger.kernel.org List-ID: 4.9-stable review patch. If anyone has any objections, please let me know. ------------------ From: Lars-Peter Clausen commit f027e0b3a774e10302207e91d304bbf99e3a8b36 upstream. The adis_probe_trigger() creates a new IIO trigger and requests an interrupt associated with the trigger. The interrupt uses the generic iio_trigger_generic_data_rdy_poll() function as its interrupt handler. Currently the driver initializes some fields of the trigger structure after the interrupt has been requested. But an interrupt can fire as soon as it has been requested. This opens up a race condition. iio_trigger_generic_data_rdy_poll() will access the trigger data structure and dereference the ops field. If the ops field is not yet initialized this will result in a NULL pointer deref. It is not expected that the device generates an interrupt at this point, so typically this issue did not surface unless e.g. due to a hardware misconfiguration (wrong interrupt number, wrong polarity, etc.). But some newer devices from the ADIS family start to generate periodic interrupts in their power-on reset configuration and unfortunately the interrupt can not be masked in the device. This makes the race condition much more visible and the following crash has been observed occasionally when booting a system using the ADIS16460. Unable to handle kernel NULL pointer dereference at virtual address 00000008 pgd = c0004000 [00000008] *pgd=00000000 Internal error: Oops: 5 [#1] PREEMPT SMP ARM Modules linked in: CPU: 0 PID: 1 Comm: swapper/0 Not tainted 4.9.0-04126-gf9739f0-dirty #257 Hardware name: Xilinx Zynq Platform task: ef04f640 task.stack: ef050000 PC is at iio_trigger_notify_done+0x30/0x68 LR is at iio_trigger_generic_data_rdy_poll+0x18/0x20 pc : [] lr : [] psr: 60000193 sp : ef051bb8 ip : 00000000 fp : ef106400 r10: c081d80a r9 : ef3bfa00 r8 : 00000087 r7 : ef051bec r6 : 00000000 r5 : ef3bfa00 r4 : ee92ab00 r3 : 00000000 r2 : 00000000 r1 : 00000000 r0 : ee97e400 Flags: nZCv IRQs off FIQs on Mode SVC_32 ISA ARM Segment none Control: 18c5387d Table: 0000404a DAC: 00000051 Process swapper/0 (pid: 1, stack limit = 0xef050210) [] (iio_trigger_notify_done) from [] (__handle_irq_event_percpu+0x88/0x118) [] (__handle_irq_event_percpu) from [] (handle_irq_event_percpu+0x1c/0x58) [] (handle_irq_event_percpu) from [] (handle_irq_event+0x38/0x5c) [] (handle_irq_event) from [] (handle_level_irq+0xa4/0x130) [] (handle_level_irq) from [] (generic_handle_irq+0x24/0x34) [] (generic_handle_irq) from [] (zynq_gpio_irqhandler+0xb8/0x13c) [] (zynq_gpio_irqhandler) from [] (generic_handle_irq+0x24/0x34) [] (generic_handle_irq) from [] (__handle_domain_irq+0x5c/0xb4) [] (__handle_domain_irq) from [] (gic_handle_irq+0x48/0x8c) [] (gic_handle_irq) from [] (__irq_svc+0x6c/0xa8) To fix this make sure that the trigger is fully initialized before requesting the interrupt. Fixes: ccd2b52f4ac6 ("staging:iio: Add common ADIS library") Reported-by: Robin Getz Signed-off-by: Lars-Peter Clausen Cc: Signed-off-by: Jonathan Cameron Signed-off-by: Greg Kroah-Hartman --- drivers/iio/imu/adis_trigger.c | 7 ++++--- 1 file changed, 4 insertions(+), 3 deletions(-) --- a/drivers/iio/imu/adis_trigger.c +++ b/drivers/iio/imu/adis_trigger.c @@ -47,6 +47,10 @@ int adis_probe_trigger(struct adis *adis if (adis->trig == NULL) return -ENOMEM; + adis->trig->dev.parent = &adis->spi->dev; + adis->trig->ops = &adis_trigger_ops; + iio_trigger_set_drvdata(adis->trig, adis); + ret = request_irq(adis->spi->irq, &iio_trigger_generic_data_rdy_poll, IRQF_TRIGGER_RISING, @@ -55,9 +59,6 @@ int adis_probe_trigger(struct adis *adis if (ret) goto error_free_trig; - adis->trig->dev.parent = &adis->spi->dev; - adis->trig->ops = &adis_trigger_ops; - iio_trigger_set_drvdata(adis->trig, adis); ret = iio_trigger_register(adis->trig); indio_dev->trig = iio_trigger_get(adis->trig);