diff options
| author | Vitaly Kuznetsov <vkuznets@redhat.com> | 2016-12-07 01:16:27 -0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2017-01-10 21:46:40 +0100 |
| commit | 56ef6718a1d8d77745033c5291e025ce18504159 (patch) | |
| tree | 6a8a35252d19385144e617cdaebafb971c5fd94e /drivers/hv/hv.c | |
| parent | 3c7630d35009e6635e5b58d62de554fd5b6db5df (diff) | |
| download | linux-stable-56ef6718a1d8d77745033c5291e025ce18504159.tar.gz linux-stable-56ef6718a1d8d77745033c5291e025ce18504159.tar.bz2 linux-stable-56ef6718a1d8d77745033c5291e025ce18504159.zip | |
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 <vkuznets@redhat.com>
Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/hv/hv.c')
| -rw-r--r-- | drivers/hv/hv.c | 5 |
1 files 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 } |