linux-kernel - [PATCH 1/1] perf probe:fix sigsegv in adding nonexistent event

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Date:	Tue, 25 Oct 2011 20:39:05 -0700
From:	furat.afram@...il.com
To:	Arnaldo Carvalho de Melo <acme@...stprotocols.net>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Paul Mackerras <paulus@...ba.org>, linux-kernel@...r.kernel.org
Cc:	Furat Afram <furat.afram@...il.com>
Subject: [PATCH 1/1] perf probe:fix sigsegv in adding nonexistent event

From: Furat Afram <furat.afram@...il.com>

pref probe crashes when trying to add nonexistent event

Signed-off-by: Furat Afram <furat.afram@...il.com>
---
 tools/perf/util/symbol.c |    8 ++++++--
 1 files changed, 6 insertions(+), 2 deletions(-)

diff --git a/tools/perf/util/symbol.c b/tools/perf/util/symbol.c
index 40eeaf0..ad0c79b 100644
--- a/tools/perf/util/symbol.c
+++ b/tools/perf/util/symbol.c
@@ -636,14 +636,18 @@ static int dso__load_all_kallsyms(struct dso *dso, const char *filename,
 static int dso__split_kallsyms(struct dso *dso, struct map *map,
 			       symbol_filter_t filter)
 {
-	struct map_groups *kmaps = map__kmap(map)->kmaps;
-	struct machine *machine = kmaps->machine;
+	struct map_groups *kmaps;
+	struct machine *machine;
 	struct map *curr_map = map;
 	struct symbol *pos;
 	int count = 0, moved = 0;	
 	struct rb_root *root = &dso->symbols[map->type];
 	struct rb_node *next = rb_first(root);
 	int kernel_range = 0;
+	kmaps = map__kmap(map)->kmaps;
+	if (kmaps == NULL)
+		return -1;
+	machine = kmaps->machine;
 
 	while (next) {
 		char *module;
-- 
1.7.6.4

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