[tip:perf/core] perf callchain: Check return value of split_add_child()

[tip-bot for Namhyung Kim <tipbot@zytor.com>]

Commit-ID:  f2bb4c5af4fe16d8b1e4ae371e1ceaa817380a88
Gitweb:     http://git.kernel.org/tip/f2bb4c5af4fe16d8b1e4ae371e1ceaa817380a88
Author:     Namhyung Kim <namhyung@kernel.org>
AuthorDate: Tue, 16 Feb 2016 23:08:23 +0900
Committer:  Arnaldo Carvalho de Melo <acme@redhat.com>
CommitDate: Fri, 19 Feb 2016 19:14:36 -0300

perf callchain: Check return value of split_add_child()

Now create_child() and add_child() return errors so check and pass it
to the caller.

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/1455631723-17345-6-git-send-email-namhyung@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
---
 tools/perf/util/callchain.c | 12 +++++++++---
 1 file changed, 9 insertions(+), 3 deletions(-)

diff --git a/tools/perf/util/callchain.c b/tools/perf/util/callchain.c
index dab2c1f..5259379 100644
--- a/tools/perf/util/callchain.c
+++ b/tools/perf/util/callchain.c
@@ -508,7 +508,7 @@ static enum match_result match_chain(struct callchain_cursor_node *node,
  * give a part of its callchain to the created child.
  * Then create another child to host the given callchain of new branch
  */
-static void
+static int
 split_add_child(struct callchain_node *parent,
 		struct callchain_cursor *cursor,
 		struct callchain_list *to_split,
@@ -520,6 +520,8 @@ split_add_child(struct callchain_node *parent,
 
 	/* split */
 	new = create_child(parent, true);
+	if (new == NULL)
+		return -1;
 
 	/* split the callchain and move a part to the new child */
 	old_tail = parent->val.prev;
@@ -554,7 +556,7 @@ split_add_child(struct callchain_node *parent,
 		node = callchain_cursor_current(cursor);
 		new = add_child(parent, cursor, period);
 		if (new == NULL)
-			return;
+			return -1;
 
 		/*
 		 * This is second child since we moved parent's children
@@ -576,6 +578,7 @@ split_add_child(struct callchain_node *parent,
 		parent->hit = period;
 		parent->count = 1;
 	}
+	return 0;
 }
 
 static enum match_result
@@ -670,7 +673,10 @@ append_chain(struct callchain_node *root,
 
 	/* we match only a part of the node. Split it and add the new chain */
 	if (matches < root->val_nr) {
-		split_add_child(root, cursor, cnode, start, matches, period);
+		if (split_add_child(root, cursor, cnode, start, matches,
+				    period) < 0)
+			return MATCH_ERROR;
+
 		return MATCH_EQ;
 	}