[PATCH] trace-cmd: handle NULL comm name in .dat file

[Josef Bacik <jbacik@fb.com>]

Sometimes the comm field in the trace.dat file can be empty which means that the
event parsing stuff can pass a NULL into pevent_register_comm.  To fix this just
check if we are NULL and generate a bogus comm name for that PID.  This keeps us
from segfaulting.  Thanks,

Signed-off-by: Josef Bacik <jbacik@fb.com>
---
 event-parse.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/event-parse.c b/event-parse.c
index 18b3587..00304fe 100644
--- a/event-parse.c
+++ b/event-parse.c
@@ -303,7 +303,10 @@ int pevent_register_comm(struct pevent *pevent, const char *comm, int pid)
 	if (!item)
 		return -1;
 
-	item->comm = strdup(comm);
+	if (comm)
+		item->comm = strdup(comm);
+	else
+		item->comm = strdup("<...>");
 	if (!item->comm) {
 		free(item);
 		return -1;
-- 
2.0.0