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Date: Wed, 21 Nov 2018 11:13:00 +0200
From: Adrian Hunter <adrian.hunter@...el.com>
To: Wen Yang <wen.yang99@....com.cn>
Cc: peterz@...radead.org, mingo@...hat.com, acme@...nel.org,
alexander.shishkin@...ux.intel.com, jolsa@...hat.com,
namhyung@...nel.org, ak@...ux.intel.com,
linux-kernel@...r.kernel.org, zhong.weidong@....com.cn,
wang.yi59@....com.cn, Julia Lawall <julia.lawall@...6.fr>
Subject: Re: [PATCH 1/4] perf intel-pt: fix potential NULL pointer dereference
in intel_pt_process_auxtrace_info
On 21/11/18 9:40 AM, Wen Yang wrote:
> This patch fixes a possible null pointer dereference in
> intel_pt_process_auxtrace_info, detected by the semantic patch
> deref_null.cocci, with the following warning:
>
> ./tools/perf/util/intel-pt.c:2579:32-49: ERROR: session -> itrace_synth_opts is NULL but dereferenced.
>
> Signed-off-by: Wen Yang <wen.yang99@....com.cn>
> Reviewed-by: Tan Hu <tan.hu@....com.cn>
> CC: Julia Lawall <julia.lawall@...6.fr>
> ---
> tools/perf/util/intel-pt.c | 3 ++-
> 1 file changed, 2 insertions(+), 1 deletion(-)
>
> diff --git a/tools/perf/util/intel-pt.c b/tools/perf/util/intel-pt.c
> index 149ff36..bac20e8 100644
> --- a/tools/perf/util/intel-pt.c
> +++ b/tools/perf/util/intel-pt.c
> @@ -2575,7 +2575,8 @@ int intel_pt_process_auxtrace_info(union perf_event *event,
> if (session->itrace_synth_opts && session->itrace_synth_opts->set) {
> pt->synth_opts = *session->itrace_synth_opts;
> } else {
> - itrace_synth_opts__set_default(&pt->synth_opts,
> + if (session->itrace_synth_opts)
> + itrace_synth_opts__set_default(&pt->synth_opts,
> session->itrace_synth_opts->default_no_sample);
> if (use_browser != -1) {
> pt->synth_opts.branches = false;
>
I would prefer to tidy it up more generally, like this:
From: Adrian Hunter <adrian.hunter@...el.com>
Date: Wed, 21 Nov 2018 11:03:04 +0200
Subject: [PATCH] perf auxtrace: Tidy itrace default options setting
Tidy itrace default options setting, reducing duplicated code and making
itrace_synth_opts__set_default() more flexible.
Signed-off-by: Adrian Hunter <adrian.hunter@...el.com>
---
tools/perf/util/auxtrace.c | 15 +++++++++++----
tools/perf/util/auxtrace.h | 4 ++--
tools/perf/util/cs-etm.c | 8 ++------
tools/perf/util/intel-bts.c | 11 ++++-------
tools/perf/util/intel-pt.c | 7 ++-----
5 files changed, 21 insertions(+), 24 deletions(-)
diff --git a/tools/perf/util/auxtrace.c b/tools/perf/util/auxtrace.c
index 72d5ba2479bf..d6016fe23c07 100644
--- a/tools/perf/util/auxtrace.c
+++ b/tools/perf/util/auxtrace.c
@@ -962,15 +962,20 @@ s64 perf_event__process_auxtrace(struct perf_session *session,
#define PERF_ITRACE_DEFAULT_LAST_BRANCH_SZ 64
#define PERF_ITRACE_MAX_LAST_BRANCH_SZ 1024
-void itrace_synth_opts__set_default(struct itrace_synth_opts *synth_opts,
- bool no_sample)
+bool itrace_synth_opts__set_default(struct itrace_synth_opts *synth_opts,
+ const struct itrace_synth_opts *tool_synth_opts)
{
+ if (tool_synth_opts && tool_synth_opts->set) {
+ *synth_opts = *tool_synth_opts;
+ return false;
+ }
+
synth_opts->branches = true;
synth_opts->transactions = true;
synth_opts->ptwrites = true;
synth_opts->pwr_events = true;
synth_opts->errors = true;
- if (no_sample) {
+ if (tool_synth_opts && tool_synth_opts->default_no_sample) {
synth_opts->period_type = PERF_ITRACE_PERIOD_INSTRUCTIONS;
synth_opts->period = 1;
synth_opts->calls = true;
@@ -982,6 +987,8 @@ void itrace_synth_opts__set_default(struct itrace_synth_opts *synth_opts,
synth_opts->callchain_sz = PERF_ITRACE_DEFAULT_CALLCHAIN_SZ;
synth_opts->last_branch_sz = PERF_ITRACE_DEFAULT_LAST_BRANCH_SZ;
synth_opts->initial_skip = 0;
+
+ return true;
}
/*
@@ -1006,7 +1013,7 @@ int itrace_parse_synth_opts(const struct option *opt, const char *str,
}
if (!str) {
- itrace_synth_opts__set_default(synth_opts, false);
+ itrace_synth_opts__set_default(synth_opts, NULL);
return 0;
}
diff --git a/tools/perf/util/auxtrace.h b/tools/perf/util/auxtrace.h
index 8e50f96d4b23..74c6d21231ed 100644
--- a/tools/perf/util/auxtrace.h
+++ b/tools/perf/util/auxtrace.h
@@ -530,8 +530,8 @@ int perf_event__process_auxtrace_error(struct perf_session *session,
union perf_event *event);
int itrace_parse_synth_opts(const struct option *opt, const char *str,
int unset);
-void itrace_synth_opts__set_default(struct itrace_synth_opts *synth_opts,
- bool no_sample);
+bool itrace_synth_opts__set_default(struct itrace_synth_opts *synth_opts,
+ const struct itrace_synth_opts *tool_synth_opts);
size_t perf_event__fprintf_auxtrace_error(union perf_event *event, FILE *fp);
void perf_session__auxtrace_error_inc(struct perf_session *session,
diff --git a/tools/perf/util/cs-etm.c b/tools/perf/util/cs-etm.c
index 73430b73570d..a1a20b4f3f82 100644
--- a/tools/perf/util/cs-etm.c
+++ b/tools/perf/util/cs-etm.c
@@ -1450,13 +1450,9 @@ int cs_etm__process_auxtrace_info(union perf_event *event,
return 0;
}
- if (session->itrace_synth_opts && session->itrace_synth_opts->set) {
- etm->synth_opts = *session->itrace_synth_opts;
- } else {
- itrace_synth_opts__set_default(&etm->synth_opts,
- session->itrace_synth_opts->default_no_sample);
+ if (itrace_synth_opts__set_default(&etm->synth_opts,
+ session->itrace_synth_opts))
etm->synth_opts.callchain = false;
- }
err = cs_etm__synth_events(etm, session);
if (err)
diff --git a/tools/perf/util/intel-bts.c b/tools/perf/util/intel-bts.c
index 7b27d77306c2..197b0599f146 100644
--- a/tools/perf/util/intel-bts.c
+++ b/tools/perf/util/intel-bts.c
@@ -914,13 +914,10 @@ int intel_bts_process_auxtrace_info(union perf_event *event,
if (dump_trace)
return 0;
- if (session->itrace_synth_opts && session->itrace_synth_opts->set) {
- bts->synth_opts = *session->itrace_synth_opts;
- } else {
- itrace_synth_opts__set_default(&bts->synth_opts,
- session->itrace_synth_opts->default_no_sample);
- if (session->itrace_synth_opts)
- bts->synth_opts.thread_stack =
+ if (itrace_synth_opts__set_default(&bts->synth_opts,
+ session->itrace_synth_opts) &&
+ session->itrace_synth_opts) {
+ bts->synth_opts.thread_stack =
session->itrace_synth_opts->thread_stack;
}
diff --git a/tools/perf/util/intel-pt.c b/tools/perf/util/intel-pt.c
index 149ff361ca78..8f4043658e7a 100644
--- a/tools/perf/util/intel-pt.c
+++ b/tools/perf/util/intel-pt.c
@@ -2572,11 +2572,8 @@ int intel_pt_process_auxtrace_info(union perf_event *event,
goto err_delete_thread;
}
- if (session->itrace_synth_opts && session->itrace_synth_opts->set) {
- pt->synth_opts = *session->itrace_synth_opts;
- } else {
- itrace_synth_opts__set_default(&pt->synth_opts,
- session->itrace_synth_opts->default_no_sample);
+ if (itrace_synth_opts__set_default(&pt->synth_opts,
+ session->itrace_synth_opts)) {
if (use_browser != -1) {
pt->synth_opts.branches = false;
pt->synth_opts.callchain = true;
--
2.17.1
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