[PATCH AUTOSEL 5.7 133/274] libbpf: Fix huge memory leak in libbpf_find_vmlinux_btf_id()

[Sasha Levin]

From: Andrii Nakryiko <andr...@fb.com>

[ Upstream commit 3521ffa2ee9a48c3236c93f54ae11c074490ebce ]

BTF object wasn't freed.

Fixes: a6ed02cac690 ("libbpf: Load btf_vmlinux only once per object.")
Signed-off-by: Andrii Nakryiko <andr...@fb.com>
Signed-off-by: Alexei Starovoitov <a...@kernel.org>
Cc: KP Singh <kpsi...@google.com>
Link: https://lore.kernel.org/bpf/20200429012111.277390-9-andr...@fb.com
Signed-off-by: Sasha Levin <sas...@kernel.org>
---
 tools/lib/bpf/libbpf.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/tools/lib/bpf/libbpf.c b/tools/lib/bpf/libbpf.c
index 63fc872723fc..cd53204d33f0 100644
--- a/tools/lib/bpf/libbpf.c
+++ b/tools/lib/bpf/libbpf.c
@@ -6688,6 +6688,7 @@ int libbpf_find_vmlinux_btf_id(const char *name,
                               enum bpf_attach_type attach_type)
 {
        struct btf *btf;
+       int err;
 
        btf = libbpf_find_kernel_btf();
        if (IS_ERR(btf)) {
@@ -6695,7 +6696,9 @@ int libbpf_find_vmlinux_btf_id(const char *name,
                return -EINVAL;
        }
 
-       return __find_vmlinux_btf_id(btf, name, attach_type);
+       err = __find_vmlinux_btf_id(btf, name, attach_type);
+       btf__free(btf);
+       return err;
 }
 
 static int libbpf_find_prog_btf_id(const char *name, __u32 attach_prog_fd)
-- 
2.25.1