Re: [PATCH] iio: dummy_evgen: Fix use after free on error in iio_dummy_evgen_create()

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Hi Dan,

On 2020-05-20 13:03, Dan Carpenter wrote:
We need to preserve the "iio_evgen->irq_sim_domain" error code before
we free "iio_evgen" otherwise it leads to a use after free.

Fixes: 337cbeb2c13e ("genirq/irq_sim: Simplify the API")
Signed-off-by: Dan Carpenter <dan.carpenter@xxxxxxxxxx>
---
 drivers/iio/dummy/iio_dummy_evgen.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/iio/dummy/iio_dummy_evgen.c
b/drivers/iio/dummy/iio_dummy_evgen.c
index 409fe0f7df1c..ee85d596e528 100644
--- a/drivers/iio/dummy/iio_dummy_evgen.c
+++ b/drivers/iio/dummy/iio_dummy_evgen.c
@@ -45,6 +45,8 @@ static struct iio_dummy_eventgen *iio_evgen;

 static int iio_dummy_evgen_create(void)
 {
+	int ret;
+
 	iio_evgen = kzalloc(sizeof(*iio_evgen), GFP_KERNEL);
 	if (!iio_evgen)
 		return -ENOMEM;
@@ -52,8 +54,9 @@ static int iio_dummy_evgen_create(void)
 	iio_evgen->irq_sim_domain = irq_domain_create_sim(NULL,
 							  IIO_EVENTGEN_NO);
 	if (IS_ERR(iio_evgen->irq_sim_domain)) {
+		ret = PTR_ERR(iio_evgen->irq_sim_domain);
 		kfree(iio_evgen);
-		return PTR_ERR(iio_evgen->irq_sim_domain);
+		return ret;
 	}

 	mutex_init(&iio_evgen->lock);

Nice catch. I've applied it to irq/irqchip-next, since
the offending patch is queued there.

Thanks,

        M.
--
Jazz is not dead. It just smells funny...



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