From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail.linuxfoundation.org ([140.211.169.12]:38234 "EHLO mail.linuxfoundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S965944AbdAJRTv (ORCPT ); Tue, 10 Jan 2017 12:19:51 -0500 Subject: patch "hv: don't reset hv_context.tsc_page on crash" added to char-misc-testing To: vkuznets@redhat.com, gregkh@linuxfoundation.org, kys@microsoft.com, stable@vger.kernel.org From: Date: Tue, 10 Jan 2017 18:19:53 +0100 Message-ID: <14840687936779@kroah.com> MIME-Version: 1.0 Content-Type: text/plain; charset=ANSI_X3.4-1968 Content-Transfer-Encoding: 8bit Sender: stable-owner@vger.kernel.org List-ID: This is a note to let you know that I've just added the patch titled hv: don't reset hv_context.tsc_page on crash to my char-misc git tree which can be found at git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc.git in the char-misc-testing branch. The patch will show up in the next release of the linux-next tree (usually sometime within the next 24 hours during the week.) The patch will be merged to the char-misc-next branch sometime soon, after it passes testing, and the merge window is open. If you have any questions about this process, please let me know. >>From 4676e55375beeccaae7cac3dc01cdbc0c37cf596 Mon Sep 17 00:00:00 2001 From: Vitaly Kuznetsov Date: Wed, 7 Dec 2016 01:16:27 -0800 Subject: hv: don't reset hv_context.tsc_page on crash It may happen that secondary CPUs are still alive and resetting hv_context.tsc_page will cause a consequent crash in read_hv_clock_tsc() as we don't check for it being not NULL there. It is safe as we're not freeing this page anyways. Signed-off-by: Vitaly Kuznetsov Signed-off-by: K. Y. Srinivasan Cc: Signed-off-by: Greg Kroah-Hartman --- drivers/hv/hv.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) diff --git a/drivers/hv/hv.c b/drivers/hv/hv.c index 13937563c9db..fbd8ce6d7ff3 100644 --- a/drivers/hv/hv.c +++ b/drivers/hv/hv.c @@ -309,9 +309,10 @@ void hv_cleanup(bool crash) hypercall_msr.as_uint64 = 0; wrmsrl(HV_X64_MSR_REFERENCE_TSC, hypercall_msr.as_uint64); - if (!crash) + if (!crash) { vfree(hv_context.tsc_page); - hv_context.tsc_page = NULL; + hv_context.tsc_page = NULL; + } } #endif } -- 2.11.0