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charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Wed, Jun 19, 2019 at 01:53:16PM -0600, Mathieu Poirier wrote: > From: Suzuki K Poulose > > 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 > Cc: Mathieu Poirier > Signed-off-by: Suzuki K Poulose > Signed-off-by: Mathieu Poirier > --- > 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... _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel