[PATCH 3.10 094/250] perf scripting: Avoid leaking the scripting_context variable

[Willy Tarreau]

From: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>

commit cf346d5bd4b9d61656df2f72565c9b354ef3ca0d upstream.

Both register_perl_scripting() and register_python_scripting() allocate
this variable, fix it by checking if it already was.

Cc: Adrian Hunter <adrian.hunter@xxxxxxxxx>
Cc: David Ahern <dsahern@xxxxxxxxx>
Cc: Frederic Weisbecker <fweisbec@xxxxxxxxx>
Cc: Jiri Olsa <jolsa@xxxxxxxxxx>
Cc: Namhyung Kim <namhyung@xxxxxxxxxx>
Cc: Tom Zanussi <tzanussi@xxxxxxxxx>
Cc: Wang Nan <wangnan0@xxxxxxxxxx>
Fixes: 7e4b21b84c43 ("perf/scripts: Add Python scripting engine")
Signed-off-by: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
Signed-off-by: Willy Tarreau <w@xxxxxx>
---
 tools/perf/util/trace-event-scripting.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/tools/perf/util/trace-event-scripting.c b/tools/perf/util/trace-event-scripting.c
index 8715a10..ae061a4 100644
--- a/tools/perf/util/trace-event-scripting.c
+++ b/tools/perf/util/trace-event-scripting.c
@@ -90,7 +90,8 @@ static void register_python_scripting(struct scripting_ops *scripting_ops)
 	if (err)
 		die("error registering py script extension");
 
-	scripting_context = malloc(sizeof(struct scripting_context));
+	if (scripting_context == NULL)
+		scripting_context = malloc(sizeof(*scripting_context));
 }
 
 #ifdef NO_LIBPYTHON
@@ -153,7 +154,8 @@ static void register_perl_scripting(struct scripting_ops *scripting_ops)
 	if (err)
 		die("error registering pl script extension");
 
-	scripting_context = malloc(sizeof(struct scripting_context));
+	if (scripting_context == NULL)
+		scripting_context = malloc(sizeof(*scripting_context));
 }
 
 #ifdef NO_LIBPERL
-- 
2.8.0.rc2.1.gbe9624a