DO NOT MERGE A security fix to check buffer length in l2c_lcc_proc_pdu (3f643441) · Commits · e / os / android_packages_modules_Bluetooth

system/stack/l2cap/l2c_fcr.cc

+12 −2

Original line number	Diff line number	Diff line
		@@ -835,7 +835,16 @@ void l2c_lcc_proc_pdu(tL2C_CCB* p_ccb, BT_HDR* p_buf) {
		}

		if (p_ccb->is_first_seg) {
		if (p_buf->len < sizeof(sdu_length)) {
		L2CAP_TRACE_ERROR("%s: buffer length=%d too small. Need at least 2.",
		__func__, p_buf->len);
		android_errorWriteWithInfoLog(0x534e4554, "120665616", -1, NULL, 0);
		/* Discard the buffer */
		osi_free(p_buf);
		return;
		}
		STREAM_TO_UINT16(sdu_length, p);

		/* Check the SDU Length with local MTU size */
		if (sdu_length > p_ccb->local_conn_cfg.mtu) {
		/* Discard the buffer */
		@@ -843,6 +852,9 @@ void l2c_lcc_proc_pdu(tL2C_CCB* p_ccb, BT_HDR* p_buf) {
		return;
		}

		p_buf->len -= sizeof(sdu_length);
		p_buf->offset += sizeof(sdu_length);

		if (sdu_length < p_buf->len) {
		L2CAP_TRACE_ERROR("%s: Invalid sdu_length: %d", __func__, sdu_length);
		android_errorWriteWithInfoLog(0x534e4554, "112321180", -1, NULL, 0);
		@@ -861,8 +873,6 @@ void l2c_lcc_proc_pdu(tL2C_CCB* p_ccb, BT_HDR* p_buf) {
		p_data->len = 0;
		p_ccb->ble_sdu_length = sdu_length;
		L2CAP_TRACE_DEBUG("%s SDU Length = %d", __func__, sdu_length);
		p_buf->len -= sizeof(sdu_length);
		p_buf->offset += sizeof(sdu_length);
		p_data->offset = 0;

		} else {