From: Jork Loeser <jloeser@xxxxxxxxxxxxx> The hv_pcibus_device structure contains an in-memory hypercall argument that must not cross a page boundary. Allocate the structure as a page to ensure that. Signed-off-by: Jork Loeser <jloeser@xxxxxxxxxxxxx> --- drivers/pci/host/pci-hyperv.c | 12 +++++++++--- 1 files changed, 9 insertions(+), 3 deletions(-) diff --git a/drivers/pci/host/pci-hyperv.c b/drivers/pci/host/pci-hyperv.c index 7bebdc6..aa836e9 100644 --- a/drivers/pci/host/pci-hyperv.c +++ b/drivers/pci/host/pci-hyperv.c @@ -2204,7 +2204,13 @@ static int hv_pci_probe(struct hv_device *hdev, struct hv_pcibus_device *hbus; int ret; - hbus = kzalloc(sizeof(*hbus), GFP_KERNEL); + /* + * hv_pcibus_device contains the hypercall arguments for retargeting in + * hv_irq_unmask(). Those must not cross a page boundary. + */ + BUILD_BUG_ON(sizeof(*hbus) > PAGE_SIZE); + + hbus = (struct hv_pcibus_device *)get_zeroed_page(GFP_KERNEL); if (!hbus) return -ENOMEM; hbus->state = hv_pcibus_init; @@ -2308,7 +2314,7 @@ static int hv_pci_probe(struct hv_device *hdev, close: vmbus_close(hdev->channel); free_bus: - kfree(hbus); + free_page((unsigned long)hbus); return ret; } @@ -2386,7 +2392,7 @@ static int hv_pci_remove(struct hv_device *hdev) irq_domain_free_fwnode(hbus->sysdata.fwnode); put_hvpcibus(hbus); wait_for_completion(&hbus->remove_event); - kfree(hbus); + free_page((unsigned long)hbus); return 0; } -- 1.7.1 _______________________________________________ devel mailing list devel@xxxxxxxxxxxxxxxxxxxxxx http://driverdev.linuxdriverproject.org/mailman/listinfo/driverdev-devel
