[PATCH 4.14 25/95] perf traceevent: Ensure read cmdlines are null terminated.

[gregkh]

From: Greg Kroah-Hartman <gre...@linuxfoundation.org>

From: Ian Rogers <irog...@google.com>

commit 137a5258939aca56558f3a23eb229b9c4b293917 upstream.

Issue detected by address sanitizer.

Fixes: cd4ceb63438e9e28 ("perf util: Save pid-cmdline mapping into tracing 
header")
Signed-off-by: Ian Rogers <irog...@google.com>
Acked-by: Namhyung Kim <namhy...@kernel.org>
Cc: Alexander Shishkin <alexander.shish...@linux.intel.com>
Cc: Jiri Olsa <jo...@redhat.com>
Cc: Mark Rutland <mark.rutl...@arm.com>
Cc: Peter Zijlstra <pet...@infradead.org>
Cc: Stephane Eranian <eran...@google.com>
Link: http://lore.kernel.org/lkml/20210226221431.1985458-1-irog...@google.com
Signed-off-by: Arnaldo Carvalho de Melo <a...@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>
---
 tools/perf/util/trace-event-read.c |    1 +
 1 file changed, 1 insertion(+)

--- a/tools/perf/util/trace-event-read.c
+++ b/tools/perf/util/trace-event-read.c
@@ -382,6 +382,7 @@ static int read_saved_cmdline(struct pev
                pr_debug("error reading saved cmdlines\n");
                goto out;
        }
+       buf[ret] = '\0';
 
        parse_saved_cmdline(pevent, buf, size);
        ret = 0;