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perf report: Fix NULL pointer dereference in hists__fprintf_nr_sample_events()

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[ Upstream commit 11b6e5482e178055ec1f2444b55f2518713809d1 ]

The 'evname' variable can be NULL, as it is checked a few lines back,
check it before using.

Fixes: 9e207ddfa2 ("perf report: Show call graph from reference events")
Cc: Adrian Hunter <[email protected]>
Cc: Alexander Shishkin <[email protected]>
Cc: Ingo Molnar <[email protected]>
Cc: Jiri Olsa <[email protected]>
Cc: Kan Liang <[email protected]>
Cc: Mark Rutland <[email protected]>
Cc: Namhyung Kim <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Link: http://lore.kernel.org/lkml/
Signed-off-by: Gaurav Singh <[email protected]>
Signed-off-by: Sasha Levin <[email protected]>
This commit is contained in:
Gaurav Singh 2020-06-08 13:18:17 -03:00 • committed by Greg Kroah-Hartman
commit 676634f1a8
1 changed files with 1 additions and 2 deletions
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3
tools/perf/builtin-report.c
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@ -462,8 +462,7 @@ static size_t hists__fprintf_nr_sample_events(struct hists *hists, struct report
if (rep->time_str)
ret += fprintf(fp, " (time slices: %s)", rep->time_str);
if (symbol_conf.show_ref_callgraph &&
strstr(evname, "call-graph=no")) {
if (symbol_conf.show_ref_callgraph && evname && strstr(evname, "call-graph=no")) {
ret += fprintf(fp, ", show reference callgraph");
}