[tip:perf/core] perf kvm: Initialize file_name var to fix segfault

[tip-bot for Arnaldo Carvalho de Melo]

Commit-ID:  20914ce5b9e1ef4a35f1f09a2c9c8fb8eb1c4d86
Gitweb:     http://git.kernel.org/tip/20914ce5b9e1ef4a35f1f09a2c9c8fb8eb1c4d86
Author:     Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
AuthorDate: Wed, 19 Dec 2012 10:59:29 -0300
Committer:  Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
CommitDate: Thu, 24 Jan 2013 16:40:13 -0300

perf kvm: Initialize file_name var to fix segfault

The 3786063 commit:

    perf kvm: Rename perf_kvm to perf_kvm_stat

Moved the file_name from inside a local struct var that initialized some
of its members, thus zero initializing the not explicitely initialized
variables, one of which was 'file_name', to a standalone local variable,
but forgot to initialize it explicitely to NULL, so it then got some
undefined value, causing a segfault in strdup when it wasn't, by luck,
zero.

Fix it by explicitely initializing it to NULL.

Cc: David Ahern <dsahern@xxxxxxxxx>
Cc: Frederic Weisbecker <fweisbec@xxxxxxxxx>
Cc: Jiri Olsa <jolsa@xxxxxxxxxx>
Cc: Mike Galbraith <efault@xxxxxx>
Cc: Namhyung Kim <namhyung@xxxxxxxxx>
Cc: Paul Mackerras <paulus@xxxxxxxxx>
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Cc: Stephane Eranian <eranian@xxxxxxxxxx>
Cc: Xiao Guangrong <xiaoguangrong@xxxxxxxxxxxxxxxxxx>
Link: http://lkml.kernel.org/n/tip-qo2jevp1bdcnh8khzdazs17s@xxxxxxxxxxxxxx
Signed-off-by: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
---
 tools/perf/builtin-kvm.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/tools/perf/builtin-kvm.c b/tools/perf/builtin-kvm.c
index ca3f80e..37a769d 100644
--- a/tools/perf/builtin-kvm.c
+++ b/tools/perf/builtin-kvm.c
@@ -973,8 +973,7 @@ __cmd_buildid_list(const char *file_name, int argc, const char **argv)
 
 int cmd_kvm(int argc, const char **argv, const char *prefix __maybe_unused)
 {
-	const char *file_name;
-
+	const char *file_name = NULL;
 	const struct option kvm_options[] = {
 		OPT_STRING('i', "input", &file_name, "file",
 			   "Input file name"),
--
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