Alexei Starovoitov ad572d1747 bpf, trace: check event type in bpf_perf_event_read ... similar to bpf_perf_event_output() the bpf_perf_event_read() helper needs to check the type of the perf_event before reading the counter. Fixes: a43eec3042 ("bpf: introduce bpf_perf_event_output() helper") Reported-by: Daniel Borkmann <daniel@iogearbox.net> Signed-off-by: Alexei Starovoitov <ast@kernel.org> Acked-by: Daniel Borkmann <daniel@iogearbox.net> Signed-off-by: David S. Miller <davem@davemloft.net>		2016-06-15 23:37:54 -07:00
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