[PATCH 04/13] tools lib traceevent: Fix kbuffer_read_at_offset()

From: Arnaldo Carvalho de Melo
Date: Thu Oct 06 2016 - 12:12:16 EST


From: Namhyung Kim <namhyung@xxxxxxxxxx>

When it's called with an offset less than or equal to the first event,
it'll return a garbage value since the data is not initialized.

Signed-off-by: Namhyung Kim <namhyung@xxxxxxxxxx>
Acked-by: Steven Rostedt <rostedt@xxxxxxxxxxx>
Cc: Jiri Olsa <jolsa@xxxxxxxxxx>
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Link: http://lkml.kernel.org/r/20161001101700.29146-1-namhyung@xxxxxxxxxx
Signed-off-by: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
---
tools/lib/traceevent/kbuffer-parse.c | 1 +
1 file changed, 1 insertion(+)

diff --git a/tools/lib/traceevent/kbuffer-parse.c b/tools/lib/traceevent/kbuffer-parse.c
index 3bcada3ae05a..65984f1c2974 100644
--- a/tools/lib/traceevent/kbuffer-parse.c
+++ b/tools/lib/traceevent/kbuffer-parse.c
@@ -622,6 +622,7 @@ void *kbuffer_read_at_offset(struct kbuffer *kbuf, int offset,

/* Reset the buffer */
kbuffer_load_subbuffer(kbuf, kbuf->subbuffer);
+ data = kbuffer_read_event(kbuf, ts);

while (kbuf->curr < offset) {
data = kbuffer_next_event(kbuf, ts);
--
2.7.4