libbpf: Fix the possible memory leak on error

[ 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@linux.alibaba.com>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/bpf/1626180159-112996-3-git-send-email-chengshuyi@linux.alibaba.com
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/tools/lib/bpf/libbpf.c b/tools/lib/bpf/libbpf.c
index 95eef7e..04cde73 100644 (file)
--- a/tools/lib/bpf/libbpf.c
+++ b/tools/lib/bpf/libbpf.c
@@ -6907,8 +6907,10 @@ __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);