>From 312859b596e83a2164a8430343d31fce2a5ad808 Mon Sep 17 00:00:00 2001 From: Jason Wang Date: Thu, 23 Mar 2017 13:07:16 +0800 Subject: [PATCH] virtio_pci: fix out of bound access for msix_names Signed-off-by: Jason Wang --- drivers/virtio/virtio_pci_common.c | 9 +++++---- 1 file changed, 5 insertions(+), 4 deletions(-) diff --git a/drivers/virtio/virtio_pci_common.c b/drivers/virtio/virtio_pci_common.c index df548a6..5905349 100644 --- a/drivers/virtio/virtio_pci_common.c +++ b/drivers/virtio/virtio_pci_common.c @@ -147,7 +147,7 @@ static int vp_find_vqs_msix(struct virtio_device *vdev, unsigned nvqs, { struct virtio_pci_device *vp_dev = to_vp_device(vdev); const char *name = dev_name(&vp_dev->vdev.dev); - int i, err = -ENOMEM, allocated_vectors, nvectors; + int i, j, err = -ENOMEM, allocated_vectors, nvectors; unsigned flags = PCI_IRQ_MSIX; bool shared = false; u16 msix_vec; @@ -212,7 +212,7 @@ static int vp_find_vqs_msix(struct virtio_device *vdev, unsigned nvqs, if (!vp_dev->msix_vector_map) goto out_disable_config_irq; - allocated_vectors = 1; /* vector 0 is the config interrupt */ + allocated_vectors = j = 1; /* vector 0 is the config interrupt */ for (i = 0; i < nvqs; ++i) { if (!names[i]) { vqs[i] = NULL; @@ -236,18 +236,19 @@ static int vp_find_vqs_msix(struct virtio_device *vdev, unsigned nvqs, continue; } - snprintf(vp_dev->msix_names[i + 1], + snprintf(vp_dev->msix_names[j], sizeof(*vp_dev->msix_names), "%s-%s", dev_name(&vp_dev->vdev.dev), names[i]); err = request_irq(pci_irq_vector(vp_dev->pci_dev, msix_vec), vring_interrupt, IRQF_SHARED, - vp_dev->msix_names[i + 1], vqs[i]); + vp_dev->msix_names[j], vqs[i]); if (err) { /* don't free this irq on error */ vp_dev->msix_vector_map[i] = VIRTIO_MSI_NO_VECTOR; goto out_remove_vqs; } vp_dev->msix_vector_map[i] = msix_vec; + j++; /* * Use a different vector for each queue if they are available, -- 2.7.4