[tip:perf/urgent] perf probe: Fix module name matching

[tip-bot for Konstantin Khlebnikov]

Commit-ID:  cb3f3378cd09aa3fe975b4ad5ee0229dc76315bb
Gitweb:     http://git.kernel.org/tip/cb3f3378cd09aa3fe975b4ad5ee0229dc76315bb
Author:     Konstantin Khlebnikov <khlebnikov@xxxxxxxxxxxxxx>
AuthorDate: Fri, 5 Aug 2016 15:22:36 +0300
Committer:  Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
CommitDate: Tue, 9 Aug 2016 10:48:09 -0300

perf probe: Fix module name matching

If module is "module" then dso->short_name is "[module]".  Substring
comparing is't enough: "raid10" matches to "[raid1]".  This patch also
checks terminating zero in module name.

Signed-off-by: Konstantin Khlebnikov <khlebnikov@xxxxxxxxxxxxxx>
Acked-by: Masami Hiramatsu <mhiramat@xxxxxxxxxx>
Link: http://lkml.kernel.org/r/147039975648.715620.12985971832789032159.stgit@buzz
Signed-off-by: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
---
 tools/perf/util/probe-event.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/tools/perf/util/probe-event.c b/tools/perf/util/probe-event.c
index d5ccb65..1201f73 100644
--- a/tools/perf/util/probe-event.c
+++ b/tools/perf/util/probe-event.c
@@ -170,8 +170,10 @@ static struct map *kernel_get_module_map(const char *module)
 		module = "kernel";
 
 	for (pos = maps__first(maps); pos; pos = map__next(pos)) {
+		/* short_name is "[module]" */
 		if (strncmp(pos->dso->short_name + 1, module,
-			    pos->dso->short_name_len - 2) == 0) {
+			    pos->dso->short_name_len - 2) == 0 &&
+		    module[pos->dso->short_name_len - 2] == '\0') {
 			return pos;
 		}
 	}