From 8f10d0149fb983aa84a02a92f9c2113d69e23cb8 Mon Sep 17 00:00:00 2001 From: "Michael S. Tsirkin" Date: Tue, 4 Apr 2017 21:04:23 +0300 Subject: Revert "virtio_pci: fix out of bound access for msix_names" This reverts commit de85ec8b07f82c8c84de7687f769e74bf4c26a1e. Follow-up patches will revert 07ec51480b5e ("virtio_pci: use shared interrupts for virtqueues") that triggered the problem so no need for this one anymore. Tested-by: Mike Galbraith Signed-off-by: Michael S. Tsirkin --- drivers/virtio/virtio_pci_common.c | 9 ++++----- 1 file changed, 4 insertions(+), 5 deletions(-) (limited to 'drivers/virtio') diff --git a/drivers/virtio/virtio_pci_common.c b/drivers/virtio/virtio_pci_common.c index 590534910dc6..df548a6fb844 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, j, err = -ENOMEM, allocated_vectors, nvectors; + int i, 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 = j = 1; /* vector 0 is the config interrupt */ + allocated_vectors = 1; /* vector 0 is the config interrupt */ for (i = 0; i < nvqs; ++i) { if (!names[i]) { vqs[i] = NULL; @@ -236,19 +236,18 @@ static int vp_find_vqs_msix(struct virtio_device *vdev, unsigned nvqs, continue; } - snprintf(vp_dev->msix_names[j], + snprintf(vp_dev->msix_names[i + 1], 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[j], vqs[i]); + vp_dev->msix_names[i + 1], 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, -- cgit v1.2.3-59-g8ed1b