tracepoint: check if the probe has been registered
Impact: fix kernel crash that can trigger during tracing If we try to remove a probe that has not been already registered, the tracepoint_entry_remove_probe() function will dereference a NULL pointer. Check the probe before removing it to avoid crashes. Signed-off-by: NFrederic Weisbecker <fweisbec@gmail.com> Acked-by: NMathieu Desnoyers <mathieu.desnoyers@polymtl.ca> Acked-by: NSteven Rostedt <srostedt@redhat.com> Signed-off-by: NIngo Molnar <mingo@elte.hu>
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