xen/x86/vpmu: Zero struct pt_regs before calling into sample handling code
Otherwise we may leak kernel stack for events that sample user registers. Reported-by: NMark Rutland <mark.rutland@arm.com> Reviewed-by: NJuergen Gross <jgross@suse.com> Signed-off-by: NBoris Ostrovsky <boris.ostrovsky@oracle.com> Cc: stable@vger.kernel.org
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