linux-kernel - [PATCH] bpftool: Fix memory leak in do_build_table

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Date:   Mon,  5 Dec 2022 12:13:00 +0400
From:   Miaoqian Lin <linmq006@...il.com>
To:     Quentin Monnet <quentin@...valent.com>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Andrii Nakryiko <andrii@...nel.org>,
        Martin KaFai Lau <martin.lau@...ux.dev>,
        Song Liu <song@...nel.org>, Yonghong Song <yhs@...com>,
        John Fastabend <john.fastabend@...il.com>,
        KP Singh <kpsingh@...nel.org>,
        Stanislav Fomichev <sdf@...gle.com>,
        Hao Luo <haoluo@...gle.com>, Jiri Olsa <jolsa@...nel.org>,
        bpf@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     linmq006@...il.com
Subject: [PATCH] bpftool: Fix memory leak in do_build_table_cb

strdup() allocates memory for path. We need to release the memory in
the following error paths. Add free() to avoid memory leak.

Fixes: 8f184732b60b ("bpftool: Switch to libbpf's hashmap for pinned paths of BPF objects")
Signed-off-by: Miaoqian Lin <linmq006@...il.com>
---
 tools/bpf/bpftool/common.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/tools/bpf/bpftool/common.c b/tools/bpf/bpftool/common.c
index 0cdb4f711510..8a820356525e 100644
--- a/tools/bpf/bpftool/common.c
+++ b/tools/bpf/bpftool/common.c
@@ -499,9 +499,11 @@ static int do_build_table_cb(const char *fpath, const struct stat *sb,
 	if (err) {
 		p_err("failed to append entry to hashmap for ID %u, path '%s': %s",
 		      pinned_info.id, path, strerror(errno));
-		goto out_close;
+		goto out_free;
 	}
 
+out_free:
+	free(path);
 out_close:
 	close(fd);
 out_ret:
-- 
2.25.1