This is a note to let you know that I've just added the patch titled
libbpf: Free btf_vmlinux when closing bpf_object
to the 5.10-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
libbpf-free-btf_vmlinux-when-closing-bpf_object.patch
and it can be found in the queue-5.10 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 7eafa0453fad740d53915d98678684fd8d80890a
Author: Hao Luo <haoluo@xxxxxxxxxx>
Date: Tue Aug 22 12:38:40 2023 -0700
libbpf: Free btf_vmlinux when closing bpf_object
[ Upstream commit 29d67fdebc42af6466d1909c60fdd1ef4f3e5240 ]
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@xxxxxxxxxx>
Signed-off-by: Andrii Nakryiko <andrii@xxxxxxxxxx>
Link: https://lore.kernel.org/bpf/20230822193840.1509809-1-haoluo@xxxxxxxxxx
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/tools/lib/bpf/libbpf.c b/tools/lib/bpf/libbpf.c
index 015ed8253f739..44646c5286fbe 100644
--- a/tools/lib/bpf/libbpf.c
+++ b/tools/lib/bpf/libbpf.c
@@ -7962,6 +7962,7 @@ 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++)
