From patchwork Tue May 11 10:44:21 2010 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit Subject: [v2] pci: cleanly backout of pci_qdev_init() From: Alex Williamson X-Patchwork-Id: 52309 Message-Id: <20100511104305.15360.71875.stgit@virtlab9.virt.bos.redhat.com> To: qemu-devel@nongnu.org Cc: blauwirbel@gmail.com, alex.williamson@redhat.com, kvm@vger.kernel.org Date: Tue, 11 May 2010 06:44:21 -0400 If the init function of a device fails, as might happen with device assignment, we never undo the work done by do_pci_register_device(). This not only causes a bit of a memory leak, but also leaves a bogus pointer in the bus devices array that can cause a segfault or garbage data from 'info pci'. Signed-off-by: Alex Williamson --- v2: Remove extraneous return from do_pci_unregister_device()( hw/pci.c | 16 +++++++++++----- 1 files changed, 11 insertions(+), 5 deletions(-) diff --git a/hw/pci.c b/hw/pci.c index f167436..3ca5f09 100644 --- a/hw/pci.c +++ b/hw/pci.c @@ -625,6 +625,13 @@ static PCIDevice *do_pci_register_device(PCIDevice *pci_dev, PCIBus *bus, return pci_dev; } +static void do_pci_unregister_device(PCIDevice *pci_dev) +{ + qemu_free_irqs(pci_dev->irq); + pci_dev->bus->devices[pci_dev->devfn] = NULL; + pci_config_free(pci_dev); +} + PCIDevice *pci_register_device(PCIBus *bus, const char *name, int instance_size, int devfn, PCIConfigReadFunc *config_read, @@ -680,10 +687,7 @@ static int pci_unregister_device(DeviceState *dev) return ret; pci_unregister_io_regions(pci_dev); - - qemu_free_irqs(pci_dev->irq); - pci_dev->bus->devices[pci_dev->devfn] = NULL; - pci_config_free(pci_dev); + do_pci_unregister_device(pci_dev); return 0; } @@ -1652,8 +1656,10 @@ static int pci_qdev_init(DeviceState *qdev, DeviceInfo *base) if (pci_dev == NULL) return -1; rc = info->init(pci_dev); - if (rc != 0) + if (rc != 0) { + do_pci_unregister_device(pci_dev); return rc; + } /* rom loading */ if (pci_dev->romfile == NULL && info->romfile != NULL)