linux-kernel - [PATCH bpf-next v4 1/4] bpf: Fix an off-by-one error in check_indirect

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Message-ID: <20260114093914.2403982-2-xukuohai@huaweicloud.com>
Date: Wed, 14 Jan 2026 17:39:11 +0800
From: Xu Kuohai <xukuohai@...weicloud.com>
To: bpf@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org
Cc: Alexei Starovoitov <ast@...nel.org>,
	Daniel Borkmann <daniel@...earbox.net>,
	Andrii Nakryiko <andrii@...nel.org>,
	Martin KaFai Lau <martin.lau@...ux.dev>,
	Eduard Zingerman <eddyz87@...il.com>,
	Yonghong Song <yonghong.song@...ux.dev>,
	Puranjay Mohan <puranjay@...nel.org>,
	Anton Protopopov <a.s.protopopov@...il.com>
Subject: [PATCH bpf-next v4 1/4] bpf: Fix an off-by-one error in check_indirect_jump

From: Xu Kuohai <xukuohai@...wei.com>

Fix an off-by-one error in check_indirect_jump() that skips the last
element returned by copy_insn_array_uniq().

Fixes: 493d9e0d6083 ("bpf, x86: add support for indirect jumps")
Signed-off-by: Xu Kuohai <xukuohai@...wei.com>
---
 kernel/bpf/verifier.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/kernel/bpf/verifier.c b/kernel/bpf/verifier.c
index faa1ecc1fe9d..22605d9e0ffa 100644
--- a/kernel/bpf/verifier.c
+++ b/kernel/bpf/verifier.c
@@ -20336,7 +20336,7 @@ static int check_indirect_jump(struct bpf_verifier_env *env, struct bpf_insn *in
 		return -EINVAL;
 	}
 
-	for (i = 0; i < n - 1; i++) {
+	for (i = 0; i < n; i++) {
 		other_branch = push_stack(env, env->gotox_tmp_buf->items[i],
 					  env->insn_idx, env->cur_state->speculative);
 		if (IS_ERR(other_branch))
-- 
2.47.3