linux-kernel - [RFC/PATCH 5/5] perf report: Fix segfault on -g fractral with --stdio

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Date:	Sat, 31 Oct 2015 02:15:38 +0900
From:	Namhyung Kim <namhyung@...nel.org>
To:	Arnaldo Carvalho de Melo <acme@...nel.org>
Cc:	Ingo Molnar <mingo@...nel.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Jiri Olsa <jolsa@...hat.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Brendan Gregg <brendan.d.gregg@...il.com>,
	David Ahern <dsahern@...il.com>
Subject: [RFC/PATCH 5/5] perf report: Fix segfault on -g fractral with --stdio

ipchain__fprintf_graph() should pass non-NULL callchain node when
printing remaining entries.  Otherwise it'll segfault since it tries to
access to the node to calculate the value.

Signed-off-by: Namhyung Kim <namhyung@...nel.org>
---
 tools/perf/ui/stdio/hist.c | 13 ++++++++++++-
 1 file changed, 12 insertions(+), 1 deletion(-)

diff --git a/tools/perf/ui/stdio/hist.c b/tools/perf/ui/stdio/hist.c
index 4a7b007c2a87..2104b09d41a8 100644
--- a/tools/perf/ui/stdio/hist.c
+++ b/tools/perf/ui/stdio/hist.c
@@ -88,6 +88,7 @@ static size_t __callchain__fprintf_graph(FILE *fp, struct rb_root *root,
 	size_t ret = 0;
 	int i;
 	uint entries_printed = 0;
+	int cumul_count = 0;
 
 	remaining = total_samples;
 
@@ -99,6 +100,7 @@ static size_t __callchain__fprintf_graph(FILE *fp, struct rb_root *root,
 		child = rb_entry(node, struct callchain_node, rb_node);
 		cumul = callchain_cumul_hits(child);
 		remaining -= cumul;
+		cumul_count += callchain_cumul_counts(child);
 
 		/*
 		 * The depth mask manages the output of pipes that show
@@ -141,12 +143,21 @@ static size_t __callchain__fprintf_graph(FILE *fp, struct rb_root *root,
 
 	if (callchain_param.mode == CHAIN_GRAPH_REL &&
 		remaining && remaining != total_samples) {
+		struct callchain_node rem_node = {
+			.hit = remaining,
+		};
 
 		if (!rem_sq_bracket)
 			return ret;
 
+		if (callchain_param.value == CCVAL_COUNT) {
+			rem_node.count = child->parent->children_count - cumul_count;
+			if (rem_node.count <= 0)
+				return ret;
+		}
+
 		new_depth_mask &= ~(1 << (depth - 1));
-		ret += ipchain__fprintf_graph(fp, NULL, &rem_hits, depth,
+		ret += ipchain__fprintf_graph(fp, &rem_node, &rem_hits, depth,
 					      new_depth_mask, 0, total_samples,
 					      left_margin);
 	}
-- 
2.6.2

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