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Commit 56ef6718 authored by Vitaly Kuznetsov's avatar Vitaly Kuznetsov Committed by Greg Kroah-Hartman
Browse files

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: default avatarVitaly Kuznetsov <vkuznets@redhat.com>
Signed-off-by: default avatarK. Y. Srinivasan <kys@microsoft.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 3c7630d3

drivers/hv/hv.c

+3 −2
Original line number Diff line number Diff line
@@ -309,10 +309,11 @@ 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;

		}

	}

#endif

}