[tip:perf/core] perf sort: Check return value of strdup()

[tip-bot for Namhyung Kim <namhyung.kim@lge.com>]

Commit-ID:  5936f54d6ca2857d81188dcdff8c61b8fc482f53
Gitweb:     http://git.kernel.org/tip/5936f54d6ca2857d81188dcdff8c61b8fc482f53
Author:     Namhyung Kim <namhyung.kim@lge.com>
AuthorDate: Wed, 6 Feb 2013 14:57:17 +0900
Committer:  Arnaldo Carvalho de Melo <acme@redhat.com>
CommitDate: Wed, 6 Feb 2013 18:09:26 -0300

perf sort: Check return value of strdup()

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.

Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Acked-by: Jiri Olsa <jolsa@redhat.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Stephane Eranian <eranian@google.com>
Link: http://lkml.kernel.org/r/1360130237-9963-3-git-send-email-namhyung@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
---
 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 d8b4882..d41926c 100644
--- a/tools/perf/util/sort.c
+++ b/tools/perf/util/sort.c
@@ -570,6 +570,11 @@ int setup_sorting(void)
 	char *tmp, *tok, *str = strdup(sort_order);
 	int ret = 0;
 
+	if (str == NULL) {
+		error("Not enough memory to setup sort keys");
+		return -ENOMEM;
+	}
+
 	for (tok = strtok_r(str, ", ", &tmp);
 			tok; tok = strtok_r(NULL, ", ", &tmp)) {
 		ret = sort_dimension__add(tok);