From mboxrd@z Thu Jan 1 00:00:00 1970 From: Dan Carpenter Subject: [PATCH 1/2] bpf: btf: silence uninitialize variable warnings Date: Fri, 27 Apr 2018 17:04:09 +0300 Message-ID: <20180427140409.GA19583@mwanda> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Cc: Daniel Borkmann , netdev@vger.kernel.org, linux-kernel@vger.kernel.org, kernel-janitors@vger.kernel.org To: Alexei Starovoitov , Martin KaFai Lau Return-path: Content-Disposition: inline Sender: linux-kernel-owner@vger.kernel.org List-Id: netdev.vger.kernel.org Smatch complains that size can be uninitialized if btf_type_id_size() returns NULL. It seems reasonable enough to check for that. Signed-off-by: Dan Carpenter --- This goes to the BPF tree (linux-next). diff --git a/kernel/bpf/btf.c b/kernel/bpf/btf.c index 22e1046a1a86..e631b6fd60d3 100644 --- a/kernel/bpf/btf.c +++ b/kernel/bpf/btf.c @@ -1229,7 +1229,8 @@ static int btf_array_check_member(struct btf_verifier_env *env, } array_type_id = member->type; - btf_type_id_size(btf, &array_type_id, &array_size); + if (!btf_type_id_size(btf, &array_type_id, &array_size)) + return -EINVAL; struct_size = struct_type->size; bytes_offset = BITS_ROUNDDOWN_BYTES(struct_bits_off); if (struct_size - bytes_offset < array_size) { @@ -1351,6 +1352,8 @@ static void btf_array_seq_show(const struct btf *btf, const struct btf_type *t, elem_type_id = array->type; elem_type = btf_type_id_size(btf, &elem_type_id, &elem_size); + if (!elem_type) + return; elem_ops = btf_type_ops(elem_type); seq_puts(m, "["); for (i = 0; i < array->nelems; i++) {