linux-kernel - [PATCH 5.13 094/300] libbpf: Fix the possible memory leak on error

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Date:   Mon, 13 Sep 2021 15:12:35 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Shuyi Cheng <chengshuyi@...ux.alibaba.com>,
        Andrii Nakryiko <andrii@...nel.org>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.13 094/300] libbpf: Fix the possible memory leak on error

From: Shuyi Cheng <chengshuyi@...ux.alibaba.com>

[ Upstream commit 18353c87e0e0440d4c7c746ed740738bbc1b538e ]

If the strdup() fails then we need to call bpf_object__close(obj) to
avoid a resource leak.

Fixes: 166750bc1dd2 ("libbpf: Support libbpf-provided extern variables")
Signed-off-by: Shuyi Cheng <chengshuyi@...ux.alibaba.com>
Signed-off-by: Andrii Nakryiko <andrii@...nel.org>
Link: https://lore.kernel.org/bpf/1626180159-112996-3-git-send-email-chengshuyi@linux.alibaba.com
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 tools/lib/bpf/libbpf.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/tools/lib/bpf/libbpf.c b/tools/lib/bpf/libbpf.c
index c41d9b2b59ac..2af2d0e4a231 100644
--- a/tools/lib/bpf/libbpf.c
+++ b/tools/lib/bpf/libbpf.c
@@ -7365,8 +7365,10 @@ __bpf_object__open(const char *path, const void *obj_buf, size_t obj_buf_sz,
 	kconfig = OPTS_GET(opts, kconfig, NULL);
 	if (kconfig) {
 		obj->kconfig = strdup(kconfig);
-		if (!obj->kconfig)
-			return ERR_PTR(-ENOMEM);
+		if (!obj->kconfig) {
+			err = -ENOMEM;
+			goto out;
+		}
 	}
 
 	err = bpf_object__elf_init(obj);
-- 
2.30.2