[PATCH -tip 2/6] perf probe: Fix mis-estimation for shorteningfilename

[Masami Hiramatsu]

Fix mis-estimation size for making a short filename.
Since the buffer size is 32 bytes and there are '@' prefix and
'\0' termination, maximum shorten filename length should be
30. This means, before searching '/', it should be 31 bytes.

Signed-off-by: Masami Hiramatsu <mhiramat@xxxxxxxxxx>
Cc: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
Cc: Paul Mackerras <paulus@xxxxxxxxx>
Cc: Paul Mackerras <paulus@xxxxxxxxx>
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Cc: Mike Galbraith <efault@xxxxxx>
Cc: Frederic Weisbecker <fweisbec@xxxxxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxx>
---

 tools/perf/util/probe-event.c |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/tools/perf/util/probe-event.c b/tools/perf/util/probe-event.c
index 1c4a20a..6d43839 100644
--- a/tools/perf/util/probe-event.c
+++ b/tools/perf/util/probe-event.c
@@ -806,12 +806,12 @@ static char *synthesize_perf_probe_point(struct perf_probe_point *pp)
 			goto error;
 	}
 	if (pp->file) {
-		len = strlen(pp->file) - 32;
+		len = strlen(pp->file) - 31;
 		if (len < 0)
 			len = 0;
 		tmp = strchr(pp->file + len, '/');
 		if (!tmp)
-			tmp = pp->file + len - 1;
+			tmp = pp->file + len;
 		ret = e_snprintf(file, 32, "@%s", tmp + 1);
 		if (ret <= 0)
 			goto error;


-- 
Masami Hiramatsu
e-mail: mhiramat@xxxxxxxxxx
--
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