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Miller" , Eric Dumazet , Paolo Abeni , Quentin Monnet , Daniel Borkmann , bpf@vger.kernel.org, oss-drivers@corigine.com, netdev@vger.kernel.org, linux-kernel@vger.kernel.org, kernel-janitors@vger.kernel.org Subject: [PATCH net] nfp: bpf: prevent integer overflow in nfp_bpf_event_output() Message-ID: <6074805b-e78d-4b8a-bf05-e929b5377c28@stanley.mountain> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Disposition: inline X-Mailer: git-send-email haha only kidding Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" The "sizeof(struct cmsg_bpf_event) + pkt_size + data_size" math could potentially have an integer wrapping bug on 32bit systems. Check for this and return an error. Fixes: 9816dd35ecec ("nfp: bpf: perf event output helpers support") Signed-off-by: Dan Carpenter Reviewed-by: Alexander Lobakin --- drivers/net/ethernet/netronome/nfp/bpf/offload.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/drivers/net/ethernet/netronome/nfp/bpf/offload.c b/drivers/net= /ethernet/netronome/nfp/bpf/offload.c index 9d97cd281f18..c03558adda91 100644 --- a/drivers/net/ethernet/netronome/nfp/bpf/offload.c +++ b/drivers/net/ethernet/netronome/nfp/bpf/offload.c @@ -458,7 +458,8 @@ int nfp_bpf_event_output(struct nfp_app_bpf *bpf, const= void *data, map_id_full =3D be64_to_cpu(cbe->map_ptr); map_id =3D map_id_full; =20 - if (len < sizeof(struct cmsg_bpf_event) + pkt_size + data_size) + if (size_add(pkt_size, data_size) > INT_MAX || + len < sizeof(struct cmsg_bpf_event) + pkt_size + data_size) return -EINVAL; if (cbe->hdr.ver !=3D NFP_CCM_ABI_VERSION) return -EINVAL; --=20 2.45.2