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[PATCHv2,bpf] bpf: Add missing btf_put to register_btf_id_dtor_kfuncs

Message ID 20230120122148.1522359-1-jolsa@kernel.org (mailing list archive)
State Accepted
Commit 74bc3a5acc82f020d2e126f56c535d02d1e74e37
Delegated to: BPF
Headers show
Series [PATCHv2,bpf] bpf: Add missing btf_put to register_btf_id_dtor_kfuncs | expand

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netdev/header_inline success No static functions without inline keyword in header files
netdev/build_32bit success Errors and warnings before: 4 this patch: 4
netdev/cc_maintainers warning 3 maintainers not CCed: kpsingh@kernel.org martin.lau@linux.dev song@kernel.org
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Commit Message

Jiri Olsa Jan. 20, 2023, 12:21 p.m. UTC 
We take the BTF reference before we register dtors and we need
to put it back when it's done.

We probably won't se a problem with kernel BTF, but module BTF
would stay loaded (because of the extra ref) even when its module
is removed.

Cc: Kumar Kartikeya Dwivedi <memxor@gmail.com>
Fixes: 5ce937d613a4 ("bpf: Populate pairs of btf_id and destructor kfunc in btf")
Acked-by: Kumar Kartikeya Dwivedi <memxor@gmail.com>
Signed-off-by: Jiri Olsa <jolsa@kernel.org>
---
v2 changes:
  - resend and added Kumar's ack

 kernel/bpf/btf.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

Comments

patchwork-bot+netdevbpf@kernel.org Jan. 20, 2023, 4:30 p.m. UTC | #1 
Hello:

This patch was applied to bpf/bpf.git (master)
by Alexei Starovoitov <ast@kernel.org>:

On Fri, 20 Jan 2023 13:21:48 +0100 you wrote:
> We take the BTF reference before we register dtors and we need
> to put it back when it's done.
> 
> We probably won't se a problem with kernel BTF, but module BTF
> would stay loaded (because of the extra ref) even when its module
> is removed.
> 
> [...]

Here is the summary with links:
  - [PATCHv2,bpf] bpf: Add missing btf_put to register_btf_id_dtor_kfuncs
    https://git.kernel.org/bpf/bpf/c/74bc3a5acc82

You are awesome, thank you!
diff mbox series

Patch

diff --git a/kernel/bpf/btf.c b/kernel/bpf/btf.c
index f7dd8af06413..b7017cae6fd1 100644
--- a/kernel/bpf/btf.c
+++ b/kernel/bpf/btf.c
@@ -7782,9 +7782,9 @@  int register_btf_id_dtor_kfuncs(const struct btf_id_dtor_kfunc *dtors, u32 add_c
 
 	sort(tab->dtors, tab->cnt, sizeof(tab->dtors[0]), btf_id_cmp_func, NULL);
 
-	return 0;
 end:
-	btf_free_dtor_kfunc_tab(btf);
+	if (ret)
+		btf_free_dtor_kfunc_tab(btf);
 	btf_put(btf);
 	return ret;
 }