[PATCH 1/9] tools lib traceevent: Handle NULL comm name

[Steven Rostedt <rostedt@goodmis.org>]

[-- Attachment #1: 0001-tools-lib-traceevent-Handle-NULL-comm-name.patch --]
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From: Josef Bacik <jbacik@fb.com>

It is possible that a pid has no associated comm attached to it, although it
can still be passed to pevent_register_comm(). But if comm is NULL, it will
cause strdup() to segfault. To prevent this from happening, if comm is NULL
use the default "<...>" name for the pid.

Link: http://lkml.kernel.org/p/1403799732-30308-1-git-send-email-jbacik@fb.com
Signed-off-by: Josef Bacik <jbacik@fb.com>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
---
 tools/lib/traceevent/event-parse.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/tools/lib/traceevent/event-parse.c b/tools/lib/traceevent/event-parse.c
index d7c37a7d9255..fdcb89be5e67 100644
--- a/tools/lib/traceevent/event-parse.c
+++ b/tools/lib/traceevent/event-parse.c
@@ -304,7 +304,10 @@ 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;
-- 
2.1.4