linux-kernel - [PATCH] rtla/osnoise: prevent NULL dereference in error handling

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Message-ID: <f964ed1f-64d2-4fde-ad3e-708331f8f358@stanley.mountain>
Date: Fri, 9 Aug 2024 15:34:30 +0300
From: Dan Carpenter <dan.carpenter@...aro.org>
To: Daniel Bristot de Oliveira <bristot@...nel.org>
Cc: Steven Rostedt <rostedt@...dmis.org>, John Kacur <jkacur@...hat.com>,
	"Luis Claudio R. Goncalves" <lgoncalv@...hat.com>,
	Clark Williams <williams@...hat.com>,
	linux-trace-kernel@...r.kernel.org, linux-kernel@...r.kernel.org,
	kernel-janitors@...r.kernel.org
Subject: [PATCH] rtla/osnoise: prevent NULL dereference in error handling

If the "tool->data" allocation fails then there is no need to call
osnoise_free_top() and, in fact, doing so will lead to a NULL dereference.

Fixes: 1eceb2fc2ca5 ("rtla/osnoise: Add osnoise top mode")
Signed-off-by: Dan Carpenter <dan.carpenter@...aro.org>
---
 tools/tracing/rtla/src/osnoise_top.c | 11 ++++-------
 1 file changed, 4 insertions(+), 7 deletions(-)

diff --git a/tools/tracing/rtla/src/osnoise_top.c b/tools/tracing/rtla/src/osnoise_top.c
index f594a44df840..2f756628613d 100644
--- a/tools/tracing/rtla/src/osnoise_top.c
+++ b/tools/tracing/rtla/src/osnoise_top.c
@@ -651,8 +651,10 @@ struct osnoise_tool *osnoise_init_top(struct osnoise_top_params *params)
 		return NULL;
 
 	tool->data = osnoise_alloc_top(nr_cpus);
-	if (!tool->data)
-		goto out_err;
+	if (!tool->data) {
+		osnoise_destroy_tool(tool);
+		return NULL;
+	}
 
 	tool->params = params;
 
@@ -660,11 +662,6 @@ struct osnoise_tool *osnoise_init_top(struct osnoise_top_params *params)
 				   osnoise_top_handler, NULL);
 
 	return tool;
-
-out_err:
-	osnoise_free_top(tool->data);
-	osnoise_destroy_tool(tool);
-	return NULL;
 }
 
 static int stop_tracing;
-- 
2.43.0