perf callchain: Check return value of fill_node()

Memory allocation in the fill_node() can fail so change its return type
to int and check it in add_child() too.

Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Acked-by: Jiri Olsa <jolsa@kernel.org>
Cc: Andi Kleen <andi@firstfloor.org>
Cc: David Ahern <dsahern@gmail.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Cc: Wang Nan <wangnan0@huawei.com>
Link: http://lkml.kernel.org/r/1455631723-17345-4-git-send-email-namhyung@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

diff --git a/tools/perf/util/callchain.c b/tools/perf/util/callchain.c
index 134d88b..a82ea6f 100644 (file)
--- a/tools/perf/util/callchain.c
+++ b/tools/perf/util/callchain.c
@@ -416,7 +416,7 @@ create_child(struct callchain_node *parent, bool inherit_children)
 /*
  * Fill the node with callchain values
  */
-static void
+static int
 fill_node(struct callchain_node *node, struct callchain_cursor *cursor)
 {
        struct callchain_cursor_node *cursor_node;
@@ -433,7 +433,7 @@ fill_node(struct callchain_node *node, struct callchain_cursor *cursor)
                call = zalloc(sizeof(*call));
                if (!call) {
                        perror("not enough memory for the code path tree");
-                       return;
+                       return -1;
                }
                call->ip = cursor_node->ip;
                call->ms.sym = cursor_node->sym;
@@ -443,6 +443,7 @@ fill_node(struct callchain_node *node, struct callchain_cursor *cursor)
                callchain_cursor_advance(cursor);
                cursor_node = callchain_cursor_current(cursor);
        }
+       return 0;
 }
 
 static struct callchain_node *
@@ -456,7 +457,16 @@ add_child(struct callchain_node *parent,
        if (new == NULL)
                return NULL;
 
-       fill_node(new, cursor);
+       if (fill_node(new, cursor) < 0) {
+               struct callchain_list *call, *tmp;
+
+               list_for_each_entry_safe(call, tmp, &new->val, list) {
+                       list_del(&call->list);
+                       free(call);
+               }
+               free(new);
+               return NULL;
+       }
 
        new->children_hit = 0;
        new->hit = period;