linux-kernel - [PATCH] rtla/osnoise: avoid NULL pointer dereference on out

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Message-ID: <1648623748-8833-1-git-send-email-baihaowen@meizu.com>
Date:   Wed, 30 Mar 2022 15:02:28 +0800
From:   Haowen Bai <baihaowen@...zu.com>
To:     Daniel Bristot de Oliveira <bristot@...nel.org>,
        Steven Rostedt <rostedt@...dmis.org>
CC:     Haowen Bai <baihaowen@...zu.com>,
        <linux-trace-devel@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: [PATCH] rtla/osnoise: avoid NULL pointer dereference on out

record is NULL and go out but dereference record->trace.

report by coccicheck:
tools/tracing/rtla/src/osnoise_top.c:650:31-36: ERROR:
record is NULL but dereferenced.

Signed-off-by: Haowen Bai <baihaowen@...zu.com>
---
 tools/tracing/rtla/src/osnoise_top.c | 9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

diff --git a/tools/tracing/rtla/src/osnoise_top.c b/tools/tracing/rtla/src/osnoise_top.c
index 72c2fd6..8cb185e 100644
--- a/tools/tracing/rtla/src/osnoise_top.c
+++ b/tools/tracing/rtla/src/osnoise_top.c
@@ -572,7 +572,7 @@ int osnoise_top_main(int argc, char **argv)
 	retval = osnoise_top_apply_config(tool, params);
 	if (retval) {
 		err_msg("Could not apply config\n");
-		goto out_top;
+		goto out_top_pre;
 	}
 
 	trace = &tool->trace;
@@ -580,14 +580,14 @@ int osnoise_top_main(int argc, char **argv)
 	retval = enable_osnoise(trace);
 	if (retval) {
 		err_msg("Failed to enable osnoise tracer\n");
-		goto out_top;
+		goto out_top_pre;
 	}
 
 	if (params->set_sched) {
 		retval = set_comm_sched_attr("osnoise/", &params->sched_param);
 		if (retval) {
 			err_msg("Failed to set sched parameters\n");
-			goto out_top;
+			goto out_top_pre;
 		}
 	}
 
@@ -597,7 +597,7 @@ int osnoise_top_main(int argc, char **argv)
 		record = osnoise_init_trace_tool("osnoise");
 		if (!record) {
 			err_msg("Failed to enable the trace instance\n");
-			goto out_top;
+			goto out_top_pre;
 		}
 
 		if (params->events) {
@@ -648,6 +648,7 @@ int osnoise_top_main(int argc, char **argv)
 
 out_top:
 	trace_events_destroy(&record->trace, params->events);
+out_top_pre:
 	params->events = NULL;
 	osnoise_free_top(tool->data);
 	osnoise_destroy_tool(record);
-- 
2.7.4