perf inject: The tool->read() call may pass a NULL evsel, handle it

Check first, as machines__deliver_event() may have
perf_evlist__id2evsel() returning NULL.

This was found while checking a report from Leo Yan that used the smatch
tool to find places where a pointer is checked before use and then,
later in the same function gets used without checking.

Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Leo Yan <leo.yan@linaro.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Link: https://lkml.kernel.org/n/tip-muvb8xqyh0gysgfjfq35w642@git.kernel.orgSigned-off-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
parent 363bbaef
...@@ -224,7 +224,7 @@ static int perf_event__repipe_sample(struct perf_tool *tool, ...@@ -224,7 +224,7 @@ static int perf_event__repipe_sample(struct perf_tool *tool,
struct perf_evsel *evsel, struct perf_evsel *evsel,
struct machine *machine) struct machine *machine)
{ {
if (evsel->handler) { if (evsel && evsel->handler) {
inject_handler f = evsel->handler; inject_handler f = evsel->handler;
return f(tool, event, sample, evsel, machine); return f(tool, event, sample, evsel, machine);
} }
......
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