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@yandex-team.ru>
Acked-by: Masami Hiramatsu <mhiramat@kernel.org>
Link: http://lkml.kernel.org/r/147039975648.715620.12985971832789032159.stgit@buzz
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

1 files changed, 3 insertions, 1 deletions

diff --git a/tools/perf/util/probe-event.c b/tools/perf/util/probe-event.c
index d5ccb656fd81..1201f73ca723 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;
                 }
         }