Donate to e Foundation | Murena handsets with /e/OS | Own a part of Murena! Learn more

Commit 5693f3fb 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 



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: default avatarVitaly Kuznetsov <vkuznets@redhat.com>
Signed-off-by: default avatarK. Y. Srinivasan <kys@microsoft.com>
Signed-off-by: default avatarSumit Semwal <sumit.semwal@linaro.org>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 03e2fb9b

drivers/hv/hv.c

+3 −2
Original line number Diff line number Diff line
@@ -305,10 +305,11 @@ 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

}