linux-kernel - Re: [PATCH bpf-next v2 23/26] bpf: Handle allocation failure in acquire_lock

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Message-ID: <CAADnVQK8+-nkvDnBq=pVkadPX9zASdTSEDn6bUe7hqgs=Bm_iQ@mail.gmail.com>
Date: Fri, 7 Feb 2025 18:04:49 -0800
From: Alexei Starovoitov <alexei.starovoitov@...il.com>
To: Kumar Kartikeya Dwivedi <memxor@...il.com>
Cc: bpf <bpf@...r.kernel.org>, LKML <linux-kernel@...r.kernel.org>, 
	Linus Torvalds <torvalds@...ux-foundation.org>, Peter Zijlstra <peterz@...radead.org>, 
	Will Deacon <will@...nel.org>, Waiman Long <llong@...hat.com>, Alexei Starovoitov <ast@...nel.org>, 
	Andrii Nakryiko <andrii@...nel.org>, Daniel Borkmann <daniel@...earbox.net>, 
	Martin KaFai Lau <martin.lau@...nel.org>, Eduard Zingerman <eddyz87@...il.com>, 
	"Paul E. McKenney" <paulmck@...nel.org>, Tejun Heo <tj@...nel.org>, Barret Rhoden <brho@...gle.com>, 
	Josh Don <joshdon@...gle.com>, Dohyun Kim <dohyunkim@...gle.com>, 
	linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>, Kernel Team <kernel-team@...a.com>
Subject: Re: [PATCH bpf-next v2 23/26] bpf: Handle allocation failure in acquire_lock_state

On Thu, Feb 6, 2025 at 2:55 AM Kumar Kartikeya Dwivedi <memxor@...il.com> wrote:
>
> The acquire_lock_state function needs to handle possible NULL values
> returned by acquire_reference_state, and return -ENOMEM.
>
> Fixes: 769b0f1c8214 ("bpf: Refactor {acquire,release}_reference_state")
> Signed-off-by: Kumar Kartikeya Dwivedi <memxor@...il.com>
> ---
>  kernel/bpf/verifier.c | 2 ++
>  1 file changed, 2 insertions(+)
>
> diff --git a/kernel/bpf/verifier.c b/kernel/bpf/verifier.c
> index 9971c03adfd5..d6999d085c7d 100644
> --- a/kernel/bpf/verifier.c
> +++ b/kernel/bpf/verifier.c
> @@ -1501,6 +1501,8 @@ static int acquire_lock_state(struct bpf_verifier_env *env, int insn_idx, enum r
>         struct bpf_reference_state *s;
>
>         s = acquire_reference_state(env, insn_idx);
> +       if (!s)
> +               return -ENOMEM;

I'll grab this fix into bpf tree.
Next time just send it separately, so the fix is not lost
in the patch bomb.