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Thu, 04 Jun 2026 15:09:07 -0700 (PDT) Received: from localhost ([2a03:2880:ff:58::]) by smtp.gmail.com with ESMTPSA id d2e1a72fcca58-8428325d9a3sm7075507b3a.34.2026.06.04.15.09.06 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 04 Jun 2026 15:09:06 -0700 (PDT) From: Amery Hung To: bpf@vger.kernel.org Cc: netdev@vger.kernel.org, alexei.starovoitov@gmail.com, andrii@kernel.org, daniel@iogearbox.net, eddyz87@gmail.com, memxor@gmail.com, martin.lau@kernel.org, mykyta.yatsenko5@gmail.com, ameryhung@gmail.com, kernel-team@meta.com Subject: [PATCH bpf-next v1 1/3] bpf: Fix dead error check on acquire_reference() in check_kfunc_call Date: Thu, 4 Jun 2026 15:09:02 -0700 Message-ID: <20260604220904.1032145-2-ameryhung@gmail.com> X-Mailer: git-send-email 2.52.0 In-Reply-To: <20260604220904.1032145-1-ameryhung@gmail.com> References: <20260604220904.1032145-1-ameryhung@gmail.com> Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit acquire_reference() returns a signed int that may be a negative errno but was converted to unsigned, which makes the subsequent error check deadcode. Fix it by declaring 'id' as int so the error path is taken correctly. Signed-off-by: Amery Hung --- kernel/bpf/verifier.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/kernel/bpf/verifier.c b/kernel/bpf/verifier.c index 8ed484cb1a8a..6446db9628ae 100644 --- a/kernel/bpf/verifier.c +++ b/kernel/bpf/verifier.c @@ -12817,9 +12817,10 @@ static int check_kfunc_call(struct bpf_verifier_env *env, struct bpf_insn *insn, struct bpf_kfunc_call_arg_meta meta; struct bpf_insn_aux_data *insn_aux; int err, insn_idx = *insn_idx_p; - u32 i, nargs, ptr_type_id, id; const struct btf_param *args; + u32 i, nargs, ptr_type_id; struct btf *desc_btf; + int id; /* skip for now, but return error when we find this in fixup_kfunc_call */ if (!insn->imm) -- 2.53.0-Meta