[PATCH 07/10] perf sort: Check return value of strdup()

[Namhyung Kim <namhyung@kernel.org>]

From: Namhyung Kim <namhyung.kim@lge.com>

When setup_sorting() is called, 'str' is passed to strtok_r() but it's
not checked to have a valid pointer.  As strtok_r() accepts NULL
pointer on a first argument and use the third argument in that case,
it can cause a trouble since our third argument, tmp, is not
initialized.

Cc: Stephane Eranian <eranian@google.com>
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
---
 tools/perf/util/sort.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/tools/perf/util/sort.c b/tools/perf/util/sort.c
index c02964cabdd0..9f827e25a2b5 100644
--- a/tools/perf/util/sort.c
+++ b/tools/perf/util/sort.c
@@ -552,6 +552,11 @@ void setup_sorting(const char * const usagestr[], const struct option *opts)
 {
 	char *tmp, *tok, *str = strdup(sort_order);
 
+	if (str == NULL) {
+		error("Not enough memory to setup sort keys");
+		exit(-1);
+	}
+
 	for (tok = strtok_r(str, ", ", &tmp);
 			tok; tok = strtok_r(NULL, ", ", &tmp)) {
 		if (sort_dimension__add(tok) < 0) {
-- 
1.7.11.7