perf callchain: Fix segfault in thread__resolve_callchain_sample()

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Do not dereference 'chain' when it is NULL.

  $ perf record -e intel_pt//u -e branch-misses:u uname
  $ perf report --itrace=l --branch-history
  perf: Segmentation fault

Fixes: e9024d519d ("perf callchain: Honour the ordering of PERF_CONTEXT_{USER,KERNEL,etc}")
Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Link: http://lore.kernel.org/lkml/20191114142538.4097-1-adrian.hunter@intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

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Adrian Hunter 2019-11-14 16:25:38 +02:00 • committed by Arnaldo Carvalho de Melo

parent a7c2b572e2

commit aceb98261e

1 changed files with 1 additions and 1 deletions

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tools/perf/util/machine.c

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