# \[PATCH AUTOSEL 5.7 133/274\] libbpf: Fix huge memory leak in libbpf\_find\_vmlinux\_btf\_id() - From: Sasha Levin \ - Date: 2020-06-09 00:56:20 - List: netdev - Page: https://ratatoskr.run/netdev/2020/06/5993554 - Thread: https://ratatoskr.run/stable/2020/06/5992566/t/3.md ```text From: Andrii Nakryiko [ Upstream commit 3521ffa2ee9a48c3236c93f54ae11c074490ebce ] BTF object wasn't freed. Fixes: a6ed02cac690 ("libbpf: Load btf_vmlinux only once per object.") Signed-off-by: Andrii Nakryiko Signed-off-by: Alexei Starovoitov Cc: KP Singh Link: https://lore.kernel.org/bpf/20200429012111.277390-9-andriin@fb.com Signed-off-by: Sasha Levin --- 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 ```