linux-kernel - [PATCH 15/25] tools lib traceevent: Handle NULL comm name

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Date:	Tue, 24 Mar 2015 13:19:30 -0300
From:	Arnaldo Carvalho de Melo <acme@...nel.org>
To:	Ingo Molnar <mingo@...nel.org>
Cc:	linux-kernel@...r.kernel.org, Josef Bacik <jbacik@...com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Jiri Olsa <jolsa@...hat.com>,
	Namhyung Kim <namhyung@...nel.org>,
	Steven Rostedt <rostedt@...dmis.org>,
	Arnaldo Carvalho de Melo <acme@...hat.com>
Subject: [PATCH 15/25] tools lib traceevent: Handle NULL comm name

From: Josef Bacik <jbacik@...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.

Signed-off-by: Josef Bacik <jbacik@...com>
Cc: Andrew Morton <akpm@...ux-foundation.org>
Cc: Jiri Olsa <jolsa@...hat.com>
Cc: Namhyung Kim <namhyung@...nel.org>
Link: http://lkml.kernel.org/r/20150324135922.549965495@goodmis.org
Link: http://lkml.kernel.org/p/1403799732-30308-1-git-send-email-jbacik@fb.com
Signed-off-by: Steven Rostedt <rostedt@...dmis.org>
Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
---
 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 8e5e4f6137bb..31d4e7da191c 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;
-- 
1.9.3

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