linux-kernel - [PATCH v2] virtio-mmio: add error check for platform_get

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Date:   Tue,  2 Jul 2019 17:48:18 +0300
From:   Ihor Matushchak <ihor.matushchak@...box.net>
To:     mst@...hat.com
Cc:     jasowang@...hat.com, virtualization@...ts.linux-foundation.org,
        linux-kernel@...r.kernel.org, ihor.matushchak@...box.net,
        iivanov.xz@...il.com
Subject: [PATCH v2] virtio-mmio: add error check for platform_get_irq

in vm_find_vqs() irq has a wrong type
so, in case of no IRQ resource defined,
wrong parameter will be passed to request_irq()

Signed-off-by: Ihor Matushchak <ihor.matushchak@...box.net>
---
Changes in v2:
Don't overwrite error code value.

 drivers/virtio/virtio_mmio.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/drivers/virtio/virtio_mmio.c b/drivers/virtio/virtio_mmio.c
index f363fbeb5ab0..e09edb5c5e06 100644
--- a/drivers/virtio/virtio_mmio.c
+++ b/drivers/virtio/virtio_mmio.c
@@ -463,9 +463,14 @@ static int vm_find_vqs(struct virtio_device *vdev, unsigned nvqs,
 		       struct irq_affinity *desc)
 {
 	struct virtio_mmio_device *vm_dev = to_virtio_mmio_device(vdev);
-	unsigned int irq = platform_get_irq(vm_dev->pdev, 0);
+	int irq = platform_get_irq(vm_dev->pdev, 0);
 	int i, err, queue_idx = 0;
 
+	if (irq < 0) {
+		dev_err(&vdev->dev, "Cannot get IRQ resource\n");
+		return irq;
+	}
+
 	err = request_irq(irq, vm_interrupt, IRQF_SHARED,
 			dev_name(&vdev->dev), vm_dev);
 	if (err)
-- 
2.17.1