Re: [PATCH] perf script: Fix possible memory leaks

From: Adrian Hunter
Date: Fri Aug 01 2014 - 07:32:29 EST


On 1/08/2014 11:24 a.m., Namhyung Kim wrote:
Some paths in perf script don't call perf_session__delete() after
creating a new session.

Signed-off-by: Namhyung Kim <namhyung@xxxxxxxxxx>
---
tools/perf/builtin-script.c | 31 ++++++++++++++++++-------------
1 file changed, 18 insertions(+), 13 deletions(-)

diff --git a/tools/perf/builtin-script.c b/tools/perf/builtin-script.c
index f57035b89c15..df0f84d7e825 100644
--- a/tools/perf/builtin-script.c
+++ b/tools/perf/builtin-script.c
@@ -1476,7 +1476,7 @@ int cmd_script(int argc, const char **argv, const char *prefix __maybe_unused)
struct perf_session *session;
char *script_path = NULL;
const char **__argv;
- int i, j, err;
+ int i, j, err = 0;
struct perf_script script = {
.tool = {
.sample = process_sample_event,
@@ -1730,14 +1730,15 @@ int cmd_script(int argc, const char **argv, const char *prefix __maybe_unused)
if (header || header_only) {
perf_session__fprintf_info(session, stdout, show_full_info);
if (header_only)
- return 0;
+ goto out_delete;
}

script.session = session;

if (cpu_list) {
- if (perf_session__cpu_bitmap(session, cpu_list, cpu_bitmap))
- return -1;
+ err = perf_session__cpu_bitmap(session, cpu_list, cpu_bitmap);
+ if (err < 0)
+ goto out_delete;
}

if (!no_callchain)
@@ -1752,53 +1753,57 @@ int cmd_script(int argc, const char **argv, const char *prefix __maybe_unused)
if (output_set_by_user()) {
fprintf(stderr,
"custom fields not supported for generated scripts");
- return -1;
+ err = -EINVAL;
+ goto out_delete;
}

input = open(file.path, O_RDONLY); /* input_name */
if (input < 0) {
perror("failed to open file");
- return -1;
+ err = -errno;
+ goto out_delete;
}

err = fstat(input, &perf_stat);
if (err < 0) {
perror("failed to stat file");
- return -1;
+ goto out_delete;
}

if (!perf_stat.st_size) {
fprintf(stderr, "zero-sized file, nothing to do!\n");
- return 0;
+ goto out_delete;
}

scripting_ops = script_spec__lookup(generate_script_lang);
if (!scripting_ops) {
fprintf(stderr, "invalid language specifier");
- return -1;
+ err = -ENOENT;
+ goto out_delete;
}

err = scripting_ops->generate_script(session->tevent.pevent,
"perf-script");
- goto out;
+ goto out_delete;
}

if (script_name) {
err = scripting_ops->start_script(script_name, argc, argv);
if (err)
- goto out;
+ goto out_delete;
pr_debug("perf script started with script %s\n\n", script_name);
}


err = perf_session__check_output_opt(session);
if (err < 0)
- goto out;
+ goto out_delete;

err = __cmd_script(&script);

- perf_session__delete(session);
cleanup_scripting();
+out_delete:
+ perf_session__delete(session);

Some of the db-export scripting I do relies on the session
being deleted before the script is stopped. I would prefer
the original order i.e. perf_session__delete() then
cleanup_scripting()
--
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