linux-kernel - [PATCH] virtio_pci: request irq error handling

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Date:   Mon, 3 Apr 2017 21:09:23 +0300
From:   "Michael S. Tsirkin" <mst@...hat.com>
To:     linux-kernel@...r.kernel.org
Cc:     Mike Galbraith <efault@....de>, Jason Wang <jasowang@...hat.com>,
        virtualization@...ts.linux-foundation.org,
        Thorsten Leemhuis <linux@...mhuis.info>,
        virtio-dev@...ts.oasis-open.org, rjones@...hat.com
Subject: [PATCH] virtio_pci: request irq error handling

On failure to request msix vectors virtio frees the vector map but fails
to reset it.  It will then attempt to use that map in vp_remove_vqs on
device removal and hybernation, resulting in memory corruption
manifesting as warnings in PCI core, hangs etc.

Reported-by: Mike Galbraith <efault@....de>
Fixes: 07ec51480b5e ("virtio_pci: use shared interrupts for virtqueues")
Signed-off-by: Michael S. Tsirkin <mst@...hat.com>
---
 drivers/virtio/virtio_pci_common.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/virtio/virtio_pci_common.c b/drivers/virtio/virtio_pci_common.c
index 2a353ab..2b1ea9b 100644
--- a/drivers/virtio/virtio_pci_common.c
+++ b/drivers/virtio/virtio_pci_common.c
@@ -266,6 +266,7 @@ static int vp_find_vqs_msix(struct virtio_device *vdev, unsigned nvqs,
 out_remove_vqs:
 	vp_remove_vqs(vdev);
 	kfree(vp_dev->msix_vector_map);
+	vp_dev->msix_vector_map = NULL;
 out_disable_config_irq:
 	vp_dev->config_vector(vp_dev, VIRTIO_MSI_NO_VECTOR);
 out_free_config_irq:
-- 
MST