[PATCH] perf: fix coredump caused by introduce of probe module option

[bookjovi]

From: root <root@xxxxxxxxxxxxxxxxxxxxx>

perf will coredump if user don't give "-m" option in probe command,
this patch fix it.

[root@localhost perf]# ./perf probe --add='PROBE'
Segmentation fault (core dumped)

Signed-off-by: Jovi Zhang <bookjovi@xxxxxxxxx>
---
 tools/perf/util/probe-event.c |   12 ++++++++----
 1 files changed, 8 insertions(+), 4 deletions(-)

diff --git a/tools/perf/util/probe-event.c b/tools/perf/util/probe-event.c
index b82d54f..1c7bfa5 100644
--- a/tools/perf/util/probe-event.c
+++ b/tools/perf/util/probe-event.c
@@ -1820,11 +1820,15 @@ static int convert_to_probe_trace_events(struct perf_probe_event *pev,
 		ret = -ENOMEM;
 		goto error;
 	}
-	tev->point.module = strdup(module);
-	if (tev->point.module == NULL) {
-		ret = -ENOMEM;
-		goto error;
+
+	if (module) {
+		tev->point.module = strdup(module);
+		if (tev->point.module == NULL) {
+			ret = -ENOMEM;
+			goto error;
+		}
 	}
+
 	tev->point.offset = pev->point.offset;
 	tev->point.retprobe = pev->point.retprobe;
 	tev->nargs = pev->nargs;
-- 
1.6.5.2

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