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[185.239.71.98]) by smtp.gmail.com with ESMTPSA id ks20sm1599314ejb.101.2021.08.19.11.15.07 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 19 Aug 2021 11:15:10 -0700 (PDT) From: butt3rflyh4ck To: mani@kernel.org, davem@davemloft.net, kuba@kernel.org Cc: linux-arm-msm@vger.kernel.org, netdev@vger.kernel.org, linux-kernel@vger.kernel.org, butt3rflyh4ck Subject: [PATCH] net: qrtr: fix another OOB Read in qrtr_endpoint_post Date: Fri, 20 Aug 2021 02:14:58 +0800 Message-Id: <20210819181458.623832-1-butterflyhuangxx@gmail.com> X-Mailer: git-send-email 2.25.1 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-arm-msm@vger.kernel.org From: butt3rflyh4ck This check was incomplete, did not consider size is 0: if (len != ALIGN(size, 4) + hdrlen) goto err; if size from qrtr_hdr is 0, the result of ALIGN(size, 4) will be 0, In case of len == hdrlen and size == 0 in header this check won't fail and if (cb->type == QRTR_TYPE_NEW_SERVER) { /* Remote node endpoint can bridge other distant nodes */ const struct qrtr_ctrl_pkt *pkt = data + hdrlen; qrtr_node_assign(node, le32_to_cpu(pkt->server.node)); } will also read out of bound from data, which is hdrlen allocated block. Fixes: 194ccc88297a ("net: qrtr: Support decoding incoming v2 packets") Fixes: ad9d24c9429e ("net: qrtr: fix OOB Read in qrtr_endpoint_post") Signed-off-by: butt3rflyh4ck Reviewed-by: Pavel Skripkin --- net/qrtr/qrtr.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/net/qrtr/qrtr.c b/net/qrtr/qrtr.c index 171b7f3be6ef..0c30908628ba 100644 --- a/net/qrtr/qrtr.c +++ b/net/qrtr/qrtr.c @@ -493,7 +493,7 @@ int qrtr_endpoint_post(struct qrtr_endpoint *ep, const void *data, size_t len) goto err; } - if (len != ALIGN(size, 4) + hdrlen) + if (!size || len != ALIGN(size, 4) + hdrlen) goto err; if (cb->dst_port != QRTR_PORT_CTRL && cb->type != QRTR_TYPE_DATA &&