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

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Message-ID: <20250206105435.2159977-24-memxor@gmail.com>
Date: Thu,  6 Feb 2025 02:54:31 -0800
From: Kumar Kartikeya Dwivedi <memxor@...il.com>
To: bpf@...r.kernel.org,
	linux-kernel@...r.kernel.org
Cc: 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@...ts.infradead.org,
	kernel-team@...a.com
Subject: [PATCH bpf-next v2 23/26] bpf: Handle allocation failure in acquire_lock_state

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;
 	s->type = type;
 	s->id = id;
 	s->ptr = ptr;
-- 
2.43.5