perf callchain: Fix segfault in thread__resolve_callchain_sample()
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>
This commit is contained in:
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a7c2b572e2
Коммит
aceb98261e
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@ -2385,7 +2385,7 @@ static int thread__resolve_callchain_sample(struct thread *thread,
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}
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}
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check_calls:
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check_calls:
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if (callchain_param.order != ORDER_CALLEE) {
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if (chain && callchain_param.order != ORDER_CALLEE) {
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err = find_prev_cpumode(chain, thread, cursor, parent, root_al,
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err = find_prev_cpumode(chain, thread, cursor, parent, root_al,
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&cpumode, chain->nr - first_call);
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&cpumode, chain->nr - first_call);
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if (err)
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if (err)
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