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hv: don't reset hv_context.tsc_page on crash

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commit 56ef6718a1 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: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Vitaly Kuznetsov
2016-12-07 01:16:27 -08:00
committed by Greg Kroah-Hartman
parent 6e936b0679
commit 664f72a17f
1 changed files with 3 additions and 2 deletions
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5
drivers/hv/hv.c
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@@ -309,9 +309,10 @@ void hv_cleanup(bool crash)
hypercall_msr.as_uint64 = 0; hypercall_msr.as_uint64 = 0;
wrmsrl(HV_X64_MSR_REFERENCE_TSC, hypercall_msr.as_uint64); wrmsrl(HV_X64_MSR_REFERENCE_TSC, hypercall_msr.as_uint64);
if (!crash) if (!crash) {
vfree(hv_context.tsc_page); vfree(hv_context.tsc_page);
hv_context.tsc_page = NULL; hv_context.tsc_page = NULL;
}
} }
#endif #endif
} }