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libbpf: Free btf_vmlinux when closing bpf_object 

I hit a memory leak when testing bpf_program__set_attach_target().
Basically, set_attach_target() may allocate btf_vmlinux, for example,
when setting attach target for bpf_iter programs. But btf_vmlinux
is freed only in bpf_object_load(), which means if we only open
bpf object but not load it, setting attach target may leak
btf_vmlinux.

So let's free btf_vmlinux in bpf_object__close() anyway.

Signed-off-by: Hao Luo <haoluo@google.com>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/bpf/20230822193840.1509809-1-haoluo@google.com
This commit is contained in:
Hao Luo 2023-08-22 12:38:40 -07:00 committed by Andrii Nakryiko
parent 87680ac797
commit 29d67fdebc
1 changed files with 1 additions and 0 deletions
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tools/lib/bpf/libbpf.c
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@ -8423,6 +8423,7 @@ void bpf_object__close(struct bpf_object *obj)
bpf_object__elf_finish(obj);
bpf_object_unload(obj);
btf__free(obj->btf);
btf__free(obj->btf_vmlinux);
btf_ext__free(obj->btf_ext);
for (i = 0; i < obj->nr_maps; i++)