linux-kernel - [PATCH v1] rtla: Fix crash due to NULL record dereference

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Message-ID: <20250322183439.393533-2-costa.shul@redhat.com>
Date: Sat, 22 Mar 2025 20:34:16 +0200
From: Costa Shulyupin <costa.shul@...hat.com>
To: Steven Rostedt <rostedt@...dmis.org>,
	Daniel Bristot de Oliveira <bristot@...nel.org>,
	Costa Shulyupin <costa.shul@...hat.com>,
	Tomas Glozar <tglozar@...hat.com>,
	John Kacur <jkacur@...hat.com>,
	"Luis Claudio R. Goncalves" <lgoncalv@...hat.com>,
	Eder Zulian <ezulian@...hat.com>,
	Dan Carpenter <dan.carpenter@...aro.org>,
	Gabriele Monaco <gmonaco@...hat.com>,
	linux-trace-kernel@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH v1] rtla: Fix crash due to NULL record dereference

The previous patch introduced a crash by dereferencing record,
which can be NULL.

Add checks to prevent the crash.

Signed-off-by: Costa Shulyupin <costa.shul@...hat.com>
---
 tools/tracing/rtla/src/osnoise_hist.c  | 3 ++-
 tools/tracing/rtla/src/osnoise_top.c   | 3 ++-
 tools/tracing/rtla/src/timerlat_hist.c | 3 ++-
 tools/tracing/rtla/src/timerlat_top.c  | 3 ++-
 4 files changed, 8 insertions(+), 4 deletions(-)

diff --git a/tools/tracing/rtla/src/osnoise_hist.c b/tools/tracing/rtla/src/osnoise_hist.c
index 7c6ef67ef3e6c..f94c7c049406d 100644
--- a/tools/tracing/rtla/src/osnoise_hist.c
+++ b/tools/tracing/rtla/src/osnoise_hist.c
@@ -983,7 +983,8 @@ int osnoise_hist_main(int argc, char *argv[])
 
 	if (osnoise_trace_is_off(tool, record)) {
 		printf("rtla osnoise hit stop tracing\n");
-		save_trace_to_file(record->trace.inst, params->trace_output);
+		if (record)
+			save_trace_to_file(record->trace.inst, params->trace_output);
 	}
 
 out_hist:
diff --git a/tools/tracing/rtla/src/osnoise_top.c b/tools/tracing/rtla/src/osnoise_top.c
index 0eeefbbbf3173..003c0f76b1ada 100644
--- a/tools/tracing/rtla/src/osnoise_top.c
+++ b/tools/tracing/rtla/src/osnoise_top.c
@@ -813,7 +813,8 @@ int osnoise_top_main(int argc, char **argv)
 
 	if (osnoise_trace_is_off(tool, record)) {
 		printf("osnoise hit stop tracing\n");
-		save_trace_to_file(record->trace.inst, params->trace_output);
+		if (record)
+			save_trace_to_file(record->trace.inst, params->trace_output);
 	}
 
 out_top:
diff --git a/tools/tracing/rtla/src/timerlat_hist.c b/tools/tracing/rtla/src/timerlat_hist.c
index 93d0c9e450204..f91efe8804586 100644
--- a/tools/tracing/rtla/src/timerlat_hist.c
+++ b/tools/tracing/rtla/src/timerlat_hist.c
@@ -1473,7 +1473,8 @@ int timerlat_hist_main(int argc, char *argv[])
 		if (!params->no_aa)
 			timerlat_auto_analysis(params->stop_us, params->stop_total_us);
 
-		save_trace_to_file(record->trace.inst, params->trace_output);
+		if (record)
+			save_trace_to_file(record->trace.inst, params->trace_output);
 	}
 
 out_hist:
diff --git a/tools/tracing/rtla/src/timerlat_top.c b/tools/tracing/rtla/src/timerlat_top.c
index 3894ac37d81ca..f082f8b91afef 100644
--- a/tools/tracing/rtla/src/timerlat_top.c
+++ b/tools/tracing/rtla/src/timerlat_top.c
@@ -1295,7 +1295,8 @@ int timerlat_top_main(int argc, char *argv[])
 		if (!params->no_aa)
 			timerlat_auto_analysis(params->stop_us, params->stop_total_us);
 
-		save_trace_to_file(record->trace.inst, params->trace_output);
+		if (record)
+			save_trace_to_file(record->trace.inst, params->trace_output);
 	} else if (params->aa_only) {
 		/*
 		 * If the trace did not stop with --aa-only, at least print the
-- 
2.48.1