From 94ebb1eea0e7174a1290def4613fd7cb70f20760 Mon Sep 17 00:00:00 2001 From: Tianyu Lan Date: Mon, 6 Apr 2020 08:53:27 -0700 Subject: [PATCH] x86/Hyper-V: Free hv_panic_page when fail to register kmsg dump [ Upstream commit 7f11a2cc10a4ae3a70e2c73361f4a9a33503539b ] If kmsg_dump_register() fails, hv_panic_page will not be used anywhere. So free and reset it. Fixes: 81b18bce48af ("Drivers: HV: Send one page worth of kmsg dump over Hyper-V during panic") Reviewed-by: Michael Kelley Signed-off-by: Tianyu Lan Link: https://lore.kernel.org/r/20200406155331.2105-3-Tianyu.Lan@microsoft.com Signed-off-by: Wei Liu Signed-off-by: Sasha Levin --- drivers/hv/vmbus_drv.c | 7 +++++-- 1 file changed, 5 insertions(+), 2 deletions(-) diff --git a/drivers/hv/vmbus_drv.c b/drivers/hv/vmbus_drv.c index 593107c20e97..40f6b73dae94 100644 --- a/drivers/hv/vmbus_drv.c +++ b/drivers/hv/vmbus_drv.c @@ -1401,9 +1401,13 @@ static int vmbus_bus_init(void) hv_panic_page = (void *)get_zeroed_page(GFP_KERNEL); if (hv_panic_page) { ret = kmsg_dump_register(&hv_kmsg_dumper); - if (ret) + if (ret) { pr_err("Hyper-V: kmsg dump register " "error 0x%x\n", ret); + hv_free_hyperv_page( + (unsigned long)hv_panic_page); + hv_panic_page = NULL; + } } else pr_err("Hyper-V: panic message page memory " "allocation failed"); @@ -1433,7 +1437,6 @@ err_alloc: hv_remove_vmbus_irq(); bus_unregister(&hv_bus); - free_page((unsigned long)hv_panic_page); unregister_sysctl_table(hv_ctl_table_hdr); hv_ctl_table_hdr = NULL; return ret;