perf session: Fix crash with invalid CPU list

commit 5d67be9 added the option to specify a range of CPUs of interest,
but does not catch an invalid CPU list:

$ perf script -c foo
Segmentation fault (core dumped)

Cc: Anton Blanchard <anton@samba.org>
Link: http://lkml.kernel.org/r/1321206327-5881-1-git-send-email-dsahern@gmail.com
Signed-off-by: David Ahern <dsahern@gmail.com>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

1 files changed, 4 insertions, 0 deletions

diff --git a/tools/perf/util/session.c b/tools/perf/util/session.c
index 85c1e6b76f0..0f4555ce906 100644
--- a/tools/perf/util/session.c
+++ b/tools/perf/util/session.c
@@ -1333,6 +1333,10 @@ int perf_session__cpu_bitmap(struct perf_session *session,
         }
 
         map = cpu_map__new(cpu_list);
+        if (map == NULL) {
+                pr_err("Invalid cpu_list\n");
+                return -1;
+        }
 
         for (i = 0; i < map->nr; i++) {
                 int cpu = map->map[i];