From bf697371db87cc1a2d04f5e8dda1b4b3e2be0f0d Mon Sep 17 00:00:00 2001 From: Andrew Melnychenko Date: Wed, 9 Jun 2021 12:58:42 +0300 Subject: virtio-pci: Added check for virtio device in PCI config cbs. Now, if virtio device is not present on virtio-bus - pci config callbacks will not lead to possible crush. The read will return "-1" which should be interpreted by a driver that pci device may be unplugged. Signed-off-by: Andrew Melnychenko Message-Id: <20210609095843.141378-3-andrew@daynix.com> Reviewed-by: Michael S. Tsirkin Signed-off-by: Michael S. Tsirkin --- hw/virtio/virtio-pci.c | 10 ++++++++++ 1 file changed, 10 insertions(+) (limited to 'hw/virtio') diff --git a/hw/virtio/virtio-pci.c b/hw/virtio/virtio-pci.c index 1bef7a2..c0d9c47 100644 --- a/hw/virtio/virtio-pci.c +++ b/hw/virtio/virtio-pci.c @@ -424,6 +424,11 @@ static uint64_t virtio_pci_config_read(void *opaque, hwaddr addr, VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus); uint32_t config = VIRTIO_PCI_CONFIG_SIZE(&proxy->pci_dev); uint64_t val = 0; + + if (vdev == NULL) { + return UINT64_MAX; + } + if (addr < config) { return virtio_ioport_read(proxy, addr); } @@ -455,6 +460,11 @@ static void virtio_pci_config_write(void *opaque, hwaddr addr, VirtIOPCIProxy *proxy = opaque; uint32_t config = VIRTIO_PCI_CONFIG_SIZE(&proxy->pci_dev); VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus); + + if (vdev == NULL) { + return; + } + if (addr < config) { virtio_ioport_write(proxy, addr, val); return; -- cgit v1.1