From: Greg KH <gregkh@linuxfoundation.org>
To: Mathieu Poirier <mathieu.poirier@linaro.org>
Cc: linux-arm-kernel@lists.infradead.org
Subject: Re: [PATCH 26/28] coresight: tmc: Smatch: Fix potential NULL pointer dereference
Date: Thu, 20 Jun 2019 08:05:21 +0200 [thread overview]
Message-ID: <20190620060521.GG26319@kroah.com> (raw)
In-Reply-To: <20190619195318.19254-27-mathieu.poirier@linaro.org>
On Wed, Jun 19, 2019 at 01:53:16PM -0600, Mathieu Poirier wrote:
> From: Suzuki K Poulose <suzuki.poulose@arm.com>
>
> Based on the following report from Smatch, fix the potential
> NULL pointer dereference check.
>
> The patch 743256e214e8: "coresight: tmc: Clean up device specific
> data" from May 22, 2019, leads to the following Smatch complaint:
>
> drivers/hwtracing/coresight/coresight-tmc-etr.c:625 tmc_etr_free_flat_buf()
> warn: variable dereferenced before check 'flat_buf' (see line 623)
>
> drivers/hwtracing/coresight/coresight-tmc-etr.c
> 622 struct etr_flat_buf *flat_buf = etr_buf->private;
> 623 struct device *real_dev = flat_buf->dev->parent;
> ^^^^^^^^^^
> The patch introduces a new NULL check
>
> 624
> 625 if (flat_buf && flat_buf->daddr)
> ^^^^^^^^
> but the existing code assumed it can be NULL.
>
> 626 dma_free_coherent(real_dev, flat_buf->size,
> 627 flat_buf->vaddr, flat_buf->daddr);
>
> Cc: Dan Carpenter <dan.carpenter@oracle.com>
> Cc: Mathieu Poirier <mathieu.poirier@linaro.org>
> Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
> Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org>
> ---
> drivers/hwtracing/coresight/coresight-tmc-etr.c | 6 ++++--
> 1 file changed, 4 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/hwtracing/coresight/coresight-tmc-etr.c b/drivers/hwtracing/coresight/coresight-tmc-etr.c
> index 5d2bf6d18961..17006705287a 100644
> --- a/drivers/hwtracing/coresight/coresight-tmc-etr.c
> +++ b/drivers/hwtracing/coresight/coresight-tmc-etr.c
> @@ -620,11 +620,13 @@ static int tmc_etr_alloc_flat_buf(struct tmc_drvdata *drvdata,
> static void tmc_etr_free_flat_buf(struct etr_buf *etr_buf)
> {
> struct etr_flat_buf *flat_buf = etr_buf->private;
> - struct device *real_dev = flat_buf->dev->parent;
>
> - if (flat_buf && flat_buf->daddr)
> + if (flat_buf && flat_buf->daddr) {
> + struct device *real_dev = flat_buf->dev->parent;
> +
> dma_free_coherent(real_dev, flat_buf->size,
> flat_buf->vaddr, flat_buf->daddr);
> + }
> kfree(flat_buf);
> }
>
> --
> 2.17.1
>
Again, 5.2-final and stable...
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next prev parent reply other threads:[~2019-06-20 6:05 UTC|newest]
Thread overview: 41+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-06-19 19:52 [PATCH 00/28] coresight: next v5.2-rc5 (V2) Mathieu Poirier
2019-06-19 19:52 ` [PATCH 01/28] coresight: Rename of_coresight to coresight-platform Mathieu Poirier
2019-06-19 19:52 ` [PATCH 02/28] coresight: platform: Make memory allocation helper generic Mathieu Poirier
2019-06-19 19:52 ` [PATCH 03/28] coresight: Make sure device uses DT for obsolete compatible check Mathieu Poirier
2019-06-19 19:52 ` [PATCH 04/28] coresight: Introduce generic platform data helper Mathieu Poirier
2019-06-19 19:52 ` [PATCH 05/28] coresight: Make device to CPU mapping generic Mathieu Poirier
2019-06-19 19:52 ` [PATCH 06/28] coresight: Remove cpu field from platform data Mathieu Poirier
2019-06-19 19:52 ` [PATCH 07/28] coresight: Remove name from platform description Mathieu Poirier
2019-06-19 19:52 ` [PATCH 08/28] coresight: Cleanup coresight_remove_conns Mathieu Poirier
2019-06-19 19:52 ` [PATCH 09/28] coresight: Reuse platform data structure for connection tracking Mathieu Poirier
2019-06-19 19:53 ` [PATCH 10/28] coresight: Rearrange platform data probing Mathieu Poirier
2019-06-19 19:53 ` [PATCH 11/28] coresight: Add support for releasing platform specific data Mathieu Poirier
2019-06-19 19:53 ` [PATCH 12/28] coresight: platform: Use fwnode handle for device search Mathieu Poirier
2019-06-19 19:53 ` [PATCH 13/28] coresight: Use fwnode handle instead of device names Mathieu Poirier
2019-06-19 19:53 ` [PATCH 14/28] coresight: Use platform agnostic names Mathieu Poirier
2019-06-19 19:53 ` [PATCH 15/28] coresight: stm: ACPI support for parsing stimulus base Mathieu Poirier
2019-06-19 19:53 ` [PATCH 16/28] coresight: Support for ACPI bindings Mathieu Poirier
2019-06-19 19:53 ` [PATCH 17/28] coresight: acpi: Support for AMBA components Mathieu Poirier
2019-06-19 19:53 ` [PATCH 18/28] coresight: acpi: Support for platform devices Mathieu Poirier
2019-06-19 19:53 ` [PATCH 19/28] coresight: Add dummy definition for of_coresight_get_cpu() Mathieu Poirier
2019-06-19 19:53 ` [PATCH 20/28] coresight: tmc-etr: Do not call smp_processor_id() from preemptible Mathieu Poirier
2019-06-20 6:02 ` Greg KH
2019-06-19 19:53 ` [PATCH 21/28] coresight: tmc-etr: alloc_perf_buf: Do not call smp_processor_id " Mathieu Poirier
2019-06-20 6:03 ` Greg KH
2019-06-19 19:53 ` [PATCH 22/28] coresight: tmc-etf: " Mathieu Poirier
2019-06-20 6:03 ` Greg KH
2019-06-19 19:53 ` [PATCH 23/28] coresight: etb10: " Mathieu Poirier
2019-06-20 6:04 ` Greg KH
2019-06-19 19:53 ` [PATCH 24/28] coresight: Potential uninitialized variable in probe() Mathieu Poirier
2019-06-20 6:04 ` Greg KH
2019-06-19 19:53 ` [PATCH 25/28] coresight: etm3x: Smatch: Fix potential NULL pointer dereference Mathieu Poirier
2019-06-20 6:04 ` Greg KH
2019-06-20 21:38 ` Mathieu Poirier
2019-06-21 6:59 ` Greg KH
2019-06-19 19:53 ` [PATCH 26/28] coresight: tmc: " Mathieu Poirier
2019-06-20 6:05 ` Greg KH [this message]
2019-06-20 21:42 ` Mathieu Poirier
2019-06-21 6:59 ` Greg KH
2019-06-19 19:53 ` [PATCH 27/28] coresight: platform: add OF/APCI dependency Mathieu Poirier
2019-06-19 19:53 ` [PATCH 28/28] coresight: replicator: Add terminate entry for acpi_device_id tables Mathieu Poirier
2019-06-20 6:08 ` [PATCH 00/28] coresight: next v5.2-rc5 (V2) Greg KH
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