linux-kernel - [PATCH] bpftool: Fix JSON writer resource leak in version command

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Message-ID: <20250616152719.28917-1-chenyuan_fl@163.com>
Date: Mon, 16 Jun 2025 11:27:19 -0400
From: Yuan Chen <chenyuan_fl@....com>
To: qmo@...nel.org,
	ast@...nel.org
Cc: bpf@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	chenyuan_fl@....com,
	Yuan Chen <chenyuan@...inos.cn>
Subject: [PATCH] bpftool: Fix JSON writer resource leak in version command

From: Yuan Chen <chenyuan@...inos.cn>

When using `bpftool --version -j/-p`, the JSON writer object
created in do_version() was not properly destroyed after use.
This caused a memory leak each time the version command was
executed with JSON output.

Fix: 004b45c0e51a (tools: bpftool: provide JSON output for all possible commands)
Signed-off-by: Yuan Chen <chenyuan@...inos.cn>
Suggested-by: Quentin Monnet <qmo@...nel.org>
---
 tools/bpf/bpftool/main.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/tools/bpf/bpftool/main.c b/tools/bpf/bpftool/main.c
index cd5963cb6058..33c68eccd2c3 100644
--- a/tools/bpf/bpftool/main.c
+++ b/tools/bpf/bpftool/main.c
@@ -533,8 +533,12 @@ int main(int argc, char **argv)
 	if (argc < 0)
 		usage();
 
-	if (version_requested)
-		return do_version(argc, argv);
+	if (version_requested) {
+		ret = do_version(argc, argv);
+		if (json_output)
+			jsonw_destroy(&json_wtr);
+		return ret;
+	}
 
 	ret = cmd_select(commands, argc, argv, do_help);
 
-- 
2.44.0