[PATCH v2 2/7] perf tools: Fix out-of-bound access to struct perf_session

[Robert Richter <robert.richter@amd.com>]

If filename is NULL there is an out-of-bound access to struct
perf_session if it would be used with perf_session__open(). Shouldn't
actually happen in current implementation as filename is always
!NULL. Fixing this by always null-terminating filename.

Signed-off-by: Robert Richter <robert.richter@amd.com>
---
 tools/perf/util/session.c |    2 +-
 tools/perf/util/session.h |    2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/tools/perf/util/session.c b/tools/perf/util/session.c
index d9318d8..ea17dfb 100644
--- a/tools/perf/util/session.c
+++ b/tools/perf/util/session.c
@@ -107,7 +107,7 @@ struct perf_session *perf_session__new(const char *filename, int mode,
 				       bool force, bool repipe,
 				       struct perf_tool *tool)
 {
-	size_t len = filename ? strlen(filename) + 1 : 0;
+	size_t len = filename ? strlen(filename) : 0;
 	struct perf_session *self = zalloc(sizeof(*self) + len);
 
 	if (self == NULL)
diff --git a/tools/perf/util/session.h b/tools/perf/util/session.h
index 30e9c6b6..7d3be1b 100644
--- a/tools/perf/util/session.h
+++ b/tools/perf/util/session.h
@@ -50,7 +50,7 @@ struct perf_session {
 	int			cwdlen;
 	char			*cwd;
 	struct ordered_samples	ordered_samples;
-	char			filename[0];
+	char			filename[1];
 };
 
 struct perf_tool;
-- 
1.7.7