perf intel-pt: Fix next 'err' value, walking trace
authorAdrian Hunter <adrian.hunter@intel.com>
Fri, 10 Dec 2021 16:23:01 +0000 (18:23 +0200)
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Tue, 14 Dec 2021 09:57:13 +0000 (10:57 +0100)
commit22e5fb70f7254263b7922047e50736c29f7af8dc
treedd55c051838d111feae30c5d98720434dc66fda7
parentf747cc563afdb44630dde633c0d0a2a4ff9643f1
perf intel-pt: Fix next 'err' value, walking trace

commit a32e6c5da599dbf49e60622a4dfb5b9b40ece029 upstream.

Code after label 'next:' in intel_pt_walk_trace() assumes 'err' is zero,
but it may not be, if arrived at via a 'goto'. Ensure it is zero.

Fixes: 7c1b16ba0e26e6 ("perf intel-pt: Add support for decoding FUP/TIP only")
Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: stable@vger.kernel.org # v5.15+
Link: https://lore.kernel.org/r/20211210162303.2288710-6-adrian.hunter@intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
tools/perf/util/intel-pt-decoder/intel-pt-decoder.c