linux-kernel - [PATCH 5/5] perf tools: Fix NULL pointer deference when vdso not found

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Date:	Wed, 22 Jun 2016 06:57:06 +0000
From:	He Kuang <hekuang@...wei.com>
To:	<peterz@...radead.org>, <mingo@...hat.com>, <acme@...nel.org>,
	<alexander.shishkin@...ux.intel.com>, <jolsa@...hat.com>,
	<wangnan0@...wei.com>, <hekuang@...wei.com>, <jpoimboe@...hat.com>,
	<ak@...ux.intel.com>, <eranian@...gle.com>, <namhyung@...nel.org>,
	<adrian.hunter@...el.com>, <sukadev@...ux.vnet.ibm.com>,
	<masami.hiramatsu.pt@...achi.com>, <tumanova@...ux.vnet.ibm.com>,
	<kan.liang@...el.com>, <penberg@...nel.org>, <dsahern@...il.com>
CC:	<linux-kernel@...r.kernel.org>
Subject: [PATCH 5/5] perf tools: Fix NULL pointer deference when vdso not found

We should check if 'dso' is a null pointer before passing it to the
function dso__type(), otherwise a segfault will be raised in
dso__data_get_fd(). In function machine__find_vdso(), the return value
checking of 'dso' is missed and this patch fixes this issue.

Signed-off-by: He Kuang <hekuang@...wei.com>
---
 tools/perf/util/vdso.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/perf/util/vdso.c b/tools/perf/util/vdso.c
index 8f81c41..7bdcad4 100644
--- a/tools/perf/util/vdso.c
+++ b/tools/perf/util/vdso.c
@@ -296,7 +296,7 @@ static struct dso *machine__find_vdso(struct machine *machine,
 		if (!dso) {
 			dso = __dsos__find(&machine->dsos, DSO__NAME_VDSO,
 					   true);
-			if (dso_type != dso__type(dso, machine))
+			if (dso && dso_type != dso__type(dso, machine))
 				dso = NULL;
 		}
 		break;
-- 
1.8.5.2