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

Commit 01088750 authored by Adrian Hunter's avatar Adrian Hunter Committed by Greg Kroah-Hartman
Browse files

perf intel-pt: Fix divide by zero when TSC is not available 



commit 076333870c2f5bdd9b6d31e7ca1909cf0c84cbfa upstream.

When TSC is not available, "timeless" decoding is used but a divide by
zero occurs if perf_time_to_tsc() is called.

Ensure the divisor is not zero.

Signed-off-by: default avatarAdrian Hunter <adrian.hunter@intel.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: stable@vger.kernel.org # v4.9+
Link: https://lkml.kernel.org/n/tip-1i4j0wqoc8vlbkcizqqxpsf4@git.kernel.org


Signed-off-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 30cedf18

tools/perf/util/intel-pt.c

+2 −0
Original line number Diff line number Diff line
@@ -2507,6 +2507,8 @@ int intel_pt_process_auxtrace_info(union perf_event *event, 
	}



	pt->timeless_decoding = intel_pt_timeless_decoding(pt);

	if (pt->timeless_decoding && !pt->tc.time_mult)

		pt->tc.time_mult = 1;

	pt->have_tsc = intel_pt_have_tsc(pt);

	pt->sampling_mode = false;

	pt->est_tsc = !pt->timeless_decoding;