From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail.linuxfoundation.org ([140.211.169.12]:55322 "EHLO mail.linuxfoundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932457AbdAKGx3 (ORCPT ); Wed, 11 Jan 2017 01:53:29 -0500 Subject: patch "hv: don't reset hv_context.tsc_page on crash" added to char-misc-next To: vkuznets@redhat.com, gregkh@linuxfoundation.org, kys@microsoft.com, stable@vger.kernel.org From: Date: Wed, 11 Jan 2017 07:53:36 +0100 Message-ID: <1484117616240152@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-next 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 also be merged in the next major kernel release during the merge window. If you have any questions about this process, please let me know. >>From 56ef6718a1d8d77745033c5291e025ce18504159 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