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authorVitaly Kuznetsov <vkuznets@redhat.com>2016-12-07 01:16:27 -0800
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2017-04-27 09:09:34 +0200
commit5693f3fb5a662ab0ab1f8ad3a0e13c820c4c47dc (patch)
treead30cdabad0dfcdedd5f5d38191d655feef4426e
parent03e2fb9b5ce80aa9ff6384384f5fbde156550971 (diff)
hv: don't reset hv_context.tsc_page on crash
commit 56ef6718a1d8d77745033c5291e025ce18504159 upstream. 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> Signed-off-by: Sumit Semwal <sumit.semwal@linaro.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
-rw-r--r--drivers/hv/hv.c5
1 files changed, 3 insertions, 2 deletions
diff --git a/drivers/hv/hv.c b/drivers/hv/hv.c
index ddbf7e7e0d98..8ce1f2e22912 100644
--- a/drivers/hv/hv.c
+++ b/drivers/hv/hv.c
@@ -305,9 +305,10 @@ 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
}